Differences of tuffaceous components dissolution and their impact on physical properties in sandstone reservoirs: A case study on Paleogene Wenchang Formation in Huizhou-Lufeng area, Zhu I Depression, Pearl River Mouth Basin, China

The element geochemical characteristics and diagenetic alteration products of tuffaceous components in sandstone reservoirs of Paleogene Wenchang Formation in typical subsags of the Huizhou-Lufeng area of the Zhu I Depression,Pearl River Mouth Basin,were identified through microscopic analysis and quantitative analysis of main and trace elements.The impacts of dissolution of different tuffaceous components on physical properties of reservoirs were discussed through quantitative characterization of reservoir physical properties.The results show that there are mainly four types of tuffaceous components in the study area,which are acidic,intermediate,basic and alkaline tuffaceous components.The acidic tuffaceous components evolved in a process of strong alteration and weak dissolution of alteration products,with a large amount of kaolinite precipitated during alteration to disenable the improvement of porosity and permeability.The intermediate and alkaline tuffaceous components evolved in a process of strong dissolution of tuffaceous components and strong alteration of residual tuffaceous components;the dissolution of tuffaceous components created intergranular pores,but the alteration products such as autogenic quartz,apatite and illite deteriorated the pore structure;ultimately,the dissolution of tuffaceous components resulted in the increase of porosity but no increase of permeability of the reservoir.The basic tuffaceous components dominantly evolved in a process of dissolution of tuffaceous components to strong dissolution of alteration products;both tuffaceous components between particles and laumontite generated from alteration can be strongly dissolved to create pores;thus,the dissolution of tuffaceous components can significantly increase the physical properties of the reservoir.

A New Juvenile Specimen of Lufengosaurus Huenei Young, 1941 (Dinosauria: Prosauropoda) from the Lower Jurassic Lower Lufeng Formation of Yunnan, Southwest China

A skull and a series of associated cervical vertebrae （ZLJ0112） discovered from the Lower Lufeng Formation （Lower Jurassic） are determined as a juvenile specimen of Lufengosaurus huenei Young 1941 based on amended autapomorphies. Differences between ZLJ0112 and the holotype （subadult specimen） are considered as ontogenetic characteristic changes of L. huenei. Since some of these differences are present in other prosauropod dinosaurs （i.e., forms of the maxillary vascular foramen are irregular; the frontal contribution to the dorsal margin of the orbit is substantial; the frontal contribution to the supratemporal fossa is absent; the supratemporal fenestra is visible in lateral view; the supraoccipital inclined at 75 degrees; the parasphenoid rostrum lies level with the occipital condyle; the retroarticular process is short; the axial postzygapophysis project caudally beyond the end of the centrum） they may be common ontogenetic changes in prosauropod dinosaurs.

A New Theropod Dinosaur from the Middle Jurassic of Lufeng,Yunnan,China

A new theropod dinosaur, Shidaisaurusjinae gen. et sp. nov., has been described on the basis of an incomplete skeleton. The specimen was found near the base of the Upper Lufeng Formation （early Middle Jurassic） in Yunnan, China. It is the first theropod dinosaur from the Middle Jurassic of Yunnan. Shidaisaurus jinae is distinguishable from other Jurassic theropods by certain features from the braincase, axis, and pelvic girdle. The absence of any pleurocoels in the axis or in any anterior dorsal vertebrae suggests that the new Lufeng theropod is relatively primitive and more plesiomorphic than most of the Middle to Late Jurassic theropods from China. Most Chinese taxa of Jurassic theropod dinosaurs have not been well described; a further detailed study will be necessary for us to determine their phylogenetic relationships with Shidaisaurusjinae.

The Late Early Cretaceous Mo Mineralization in the South China Mo Province: Constraints from U–Pb and Re–Os Geochronology of the Lufeng Porphyry Mo Deposit

Compared to other Mo provinces,few studies focused on the South China Mo Province(SCMP),especially for Early Cretaceous Mo mineralization.The Lufeng porphyry Mo deposit in the SCMP is characterized by disseminated and veinlet-type mineralization in granite porphyry,gneiss,and rhyolite.In this study,six molybdenite samples yield a Re–Os isochron age of 108.0±1.8 Ma,which is consistent with the zircon U–Pb age of the granite porphyry(108.4±0.8 Ma).The coincidence of magmatic and hydrothermal activities indicates that Mo mineralization was associated with the intrusion of granite porphyry during the late Early Cretaceous.A compilation of U–Pb and Re–Os chronological data suggests that an extensive and intensive Mo mineralization event occurred in the SCMP during the late Early Cretaceous.The marked difference in molybdenite Re contents between Cu-bearing(85–536 ppm)and Cu-barren(1.3–59 ppm)Mo deposits of the late Early Cretaceous indicates that the ore-forming materials were derived from strong crust–mantle interactions.Together with regional petrological and geochemical data,this study suggests that late Early Cretaceous Mo mineralization in the SCMP occurred in an extensional setting associated with the roll-back of the Paleo-Pacific slab.

Miocene paleoenvironmental evolution based on benthic foraminiferal assemblages in the Lufeng Sag, northern South China Sea

The Miocene epoch marks the most crucial period during the Cenozoic cooling trend, characterized by the Middle Miocene Climatic Optimum(MMCO) and a series of short–lived cooling events(Miocene isotope events).To understand the paleoenvironmental evolution along the shallow water shelf in the South China Sea during the Miocene, the benthic foraminiferal assemblage and total organic carbon content(TOC) were analyzed at Hole LF14 located in the Lufeng Sag, northern South China Sea. Three benthic foraminiferal assemblages(e.g., the Uvigerina spp. assemblage, the Cibicides spp. assemblage, and the Cibicidoides spp. assemblage), corresponding to different watermass conditions, were recognized based on Q–mode factor analysis. Early studies suggested that Hole LF14 was deposited under semienclosed bay, middle to outer shelf or even upper bathyal environment during ～18.7–4.53 Ma. The dominant Uvigerina spp. assemblage was characterized by low diversity and shallow infaunal to infaunal species, indicating a warm, low–oxygenation and eutrophic conditions since the Early Miocene to MMCO(～18.7–14.24 Ma). An abrupt sea level drop and significant faunal changes were recorded during 14.24–13.41 Ma, suggesting development of the East Antarctic Ice Sheets, which resulted in a drop of sea level and change in benthic foraminiferal assemblages along the shallow water shelf. Beyond the Uvigerina spp.assemblage, the Cibicides spp. assemblage became important during the middle–late Middle Miocene(14.24–11.54 Ma). This assemblage was dominated by epifaunal species with relative high diversity, suggesting high–energy, high–oxygenation and oligotrophic conditions with episodic supply of organic food. The dominant Cibicidoides spp. assemblage with high diversity, indicates a mesotrophic conditions with relative high–oxygen content during the Late Miocene to Pliocene(11.54–4.53 Ma). The appearance and continuous occurrence of Ammonia spp. and Pseudorotalia spp. since 10.02 Ma, may reflect the influence of the Kuroshio Current.

A Juvenile Specimen of Sauropodomorpha from the Lower Jurassic of China and a Brief Review of the Lufeng Sauropodomorph Fauna

An incomplete dinosaur skeleton,including a partial skull,recently discovered from the Lower Jurassic Lufeng Formation of Yunnan,China,is here reported.Apart from its small size,little anatomical evidence supports,a priori,the non-adult status of this new sauropodomorph specimen but osteohistological analyses suggest that it is a fast-growing juvenile.This specimen represents only the second occurrence of a juvenile non-sauropodan sauropodomorph in the Lufeng Basin.The anatomy of the new specimen does not match that of other Lower Jurassic immature specimens;although cranial material is preserved,it does not display the diagnostic characters of early sauropodomorphs from the same horizon,namely Lufengosaurus,Yizhousaurus and Yunnanosaurus.Our phylogenetic analysis places the new specimen in a position relatively distant from other Chinese sauropodomorphs,and corroborates the anatomical evidence showing it is not referable to any known species already excavated in Yunnan.This result is interpreted with caution considering that ontogeny affects phylogenetic reconstruction.A thorough comparison with adult forms,taking into account ontogenyrelated characters,suggests that this Lufeng juvenile might represent a previously unknown species of early sauropodomorph.

MODELLING OF COMPOSITION OF MANTLE SOURCE FOR THE JIJIE ALKALINE-ULTRABASIC INTRUSIVE COMPLEX, LUFENG, YUNNAN

Based on the data on petrology and geochemisty for the Jijie alkaline-ultrabasic intrusive rock complex, this paper, by means of correlation, suggested that the average composition of melteigites with 10% olivine added (Fo=86) can be considered as the composition of the primary magma of the Jijie complex. This magma, whose composition is estimated from the incompatible element P2O5, was produced by 3%±partial melting of pyrolites. The results of Petrological Mixing Calculating showed that the mantle-source rocks of the Jijie complex are obviously depleted in incompatible elements.

Geochemistry of Alkaline-Ultrabasic Rocks in the Jijie Complex, Lufeng, Yunnan

This paper is concerned with the geochemical features of major elements, transitionmetal elements, large ion lithophile elements, rare-earth elements and Sr isotopes in alkaline-ul-trabasic rocks in the Jijie complex of Lufeng, Yunnan Province, which is located in southernSichuan-Yunnan rift zone, one of Luoci alkaline-ultrabasic complexes in central Ynnnan.Moreover, its origin pertaining primary magma, magma soure region, fractional crystallization,etc. are also discussed in the present paper.

双酶法优化禄丰香醋糖化工艺

为提高禄丰香醋的生产效率,通过添加α-淀粉酶与糖化酶,对禄丰香醋生产过程中糖化工艺进行优化。糖化工艺包括液化工艺与糖化工艺两部分:液化实验以还原糖为指标;糖化实验以还原糖为主要指标,黄酮类物质、氨基酸态氮为次要指标。在单因素实验的基础上,采用响应面分析法对禄丰香醋糖化过程中的参数进行优化。研究结果表明,禄丰香醋的最佳糖化工艺参数为α-淀粉酶添加量2.272%、液化pH 4.9、液化温度50℃、液化时间43 min,此条件下还原糖含量为5.372 g/100 g。结合实际生产情况,当糖化酶添加量为2.336%、糖化pH为4、糖化温度为55℃、糖化时间为60 min、蒸煮时间为1 h、料液比为1∶3时得到还原糖含量为13.614 g/100 g,黄酮含量为6.867 mg/L,氨基酸态氮含量为0.101724 g/dL。

惠陆低凸起东侧早文昌期源-汇系统分析与勘探实践

惠陆低凸起东侧为陆丰南富生烃洼陷,为厘清该低凸起东侧物源面貌及沉积储层分布规律,综合利用钻井和三维地震资料,恢复了古物源区面貌,描述了源-汇体系要素,预测了富砂沉积体平面分布,并探讨了砂体差异富集的控制因素。结果表明:惠陆低凸起发育完整的受古地貌控制的源-汇系统,研究区古近纪下文昌组进一步可划分为A—H共8个凸起群单元,在古地貌恢复的基础之上,8个凸起群单元共划分出17个由独立流域和对应沉积区组成的源-汇系统。惠陆低凸起东侧发育流域1—6组成的6个独立的源-汇系统,其中流域2、4和6剥蚀范围大,基底受剥蚀能力强,水系发育数量多且相对汇聚,是主要的优势物源供给区。2号流域(陆丰13东洼缓坡中部)大的剥蚀面积、花岗岩和喷出岩母岩为大型辫状河三角洲及优势储层发育提供了物质基础,多个水系和平面上的优势汇聚为优质的水下分流河道砂岩储层提供了良好的发育条件。

基于地质工程一体化的海上低渗油田压裂实践与认识——以珠江口盆地陆丰凹陷为例

珠江口盆地作为中国海上低渗油气的重要成藏区,低渗油气资源量巨大。陆丰凹陷L44油田是南海东部首个整装压裂开发的低渗油田,为提升开发效益,采用压裂等储层改造方式,但压裂后存在改造规模未达预期、裂缝起裂机理认识不清等问题。建立了一种基于地震解释、测井、地质相结合的海上低渗油田地质工程一体化建模方法,使裂缝扩展延伸更加准确。对研究区开展了三维地质力学建模和地质工程双甜点优选,提出了适用于海上低渗油田压裂设计的储层射孔段长度上限,对C3井重新进行了压裂方案设计和产能模拟,经二次压裂投产后产量水平与设计预期基本相符。研究结果表明:(1)低排量条件下,射孔段长度由4m增至16m,单段裂缝长度平均减少30m,前5年单井累计产能减小88%;(2)射孔段长度的增大对改造规模起到抑制作用,射孔段长度大于6m时,改造范围大幅减小,射孔段长度小于6m时,改造范围减小幅度不大,最优射孔段长度不应大于6m;(3)射孔段长度小于6m时,施工排量每提升1m^(3)/min,储层改造体积平均增幅为10.97%,提高施工排量可实现进一步增大压裂改造体积的目标。建立的海上低渗油田地质工程一体化建模方法为南海东部低渗油田的开发方案和压裂方案设计提供了全新认识,有利于提升油田开发效益。

砂岩储层中凝灰质溶蚀效应的物理模拟实验研究——以珠江口盆地惠州—陆丰地区古近系文昌组为例

为认识埋藏过程中酸性流体对碎屑岩储层中凝灰质的溶蚀改造效应及控制因素,选取珠江口盆地珠一坳陷惠州—陆丰地区古近系文昌组凝灰质砂岩储层,设计开展了岩心尺度的流体—岩石相互作用模拟实验。通过显微镜下观察、流体成分分析、物性表征等方法,对比分析了实验前后不同流体流速、不同凝灰质含量条件下砂岩储层的溶蚀作用和物性响应特征。结果表明,酸性流体环境中凝灰质溶蚀现象普遍,但不同实验条件下,凝灰质溶蚀强度及储层物性响应不同:成岩体系的开放性与封闭性决定凝灰质的溶蚀作用强弱。相同岩石和相同酸性流体条件下,高流速开放体系中凝灰质溶蚀量高于封闭体系,且低流速相对封闭体系中溶蚀产物趋于沉淀,溶蚀作用增孔效应有限。凝灰质含量显著影响溶蚀效应,富凝灰质砂岩中溶蚀作用有限,含凝灰质砂岩和贫凝灰质砂岩能够溶蚀增孔,且含凝灰质砂岩的溶蚀增孔效率更高。凝灰质含量相对中等—较低的储层中,中浅层埋藏阶段的开放成岩流体体系最有利于粒间凝灰质溶孔的发育。经历晚期酸性流体溶蚀改造后,较易形成次生溶蚀型优质储层,这一认识有助于不同地区的溶蚀型储层甜点预测。

乡村生活圈可持续供给的规划路径与实践

基于级差地租、城乡要素流动规律等理论基础和农村“三块地”制度变革等政策背景,分析乡村地区在“级差扰动、要素循环、服务升级”方面产生可持续供给方式的内在潜力,探索乡村生活圈推进可持续供给的转变趋势。以此为基础,提出乡村振兴示范带与乡村生活圈“圈带协同”的规划路径,基于乡村振兴示范带沿线空间的增值收益,支持乡村公共服务设施营建,并从空间载体、梯度联动、共享机制等方面进行思路演绎与实践论证,以期为相关研究提供借鉴。

珠江口盆地陆丰南地区文昌组沉积古环境恢复及烃源岩有机质富集主控因素研究

文昌组为陆丰南地区主力烃源岩发育层段,为了恢复文昌期沉积古环境,探讨优质烃源岩有机质富集主控因素,选用166组文昌组泥岩样品的主、微量元素测试数据,采用元素地球化学方法,在研究区首次详尽分析文昌期不同次洼、不同层段的古盐度、古气候、古水深和古氧相的纵横向演变规律,并探讨部分钻井出现盐度异常的原因及三芳甲藻甾烷、球藻对古环境的指示意义,结合TOC、古生产力和陆源输入变化研究,明确了研究区优质烃源岩的主控因素。结果表明:陆丰南地区始新统文昌组沉积期水体以淡水环境为主,局部层段盐度微弱增加,垂向上,从文四段向文一+二段水体盐度逐渐降低,横向上,文四段沉积期,陆丰15洼水体盐度最高,文三段—文一+二段沉积期,陆丰13东洼水体盐度较高。推测陆丰南地区文昌组水体盐度变化受到海侵影响,文四段沉积期,海侵影响主要集中在陆丰15洼,文三段沉积期,海侵影响扩大至陆丰15洼和陆丰13东洼东侧,进入文一+二段沉积期,受海侵影响程度较小。球藻及三芳甲藻甾烷在研究区不能作为水体咸化或者海侵的判别指标,球藻含量变化与古气候、古生产力、古水深关系密切,受古盐度变化影响有限。陆丰南地区文四段沉积期古气候温湿,古水深最大,还原性最强,进入文三段、文一+二段,气候温湿程度、水深和还原性均有所降低;文四段沉积期陆丰13东洼水深最大,其次为陆丰15洼,还原性陆丰13东洼最强,其次为陆丰13西洼。文昌组烃源岩有机质富集主要受控于古生产力和古陆源输入,其次受古气候和古水深控制,古氧相变化对有机质富集控制作用较弱,高古生产力主导着文昌组优质烃源岩的形成及分布,主要发育生产力富集模式。

Paleogene geological framework and tectonic evolution of the central anticlinal zone in Lufeng 13 sag,Pearl River Mouth Basin

The Paleogene geological framework and evolution process in the central anticline zone in the Lufeng 13 sag in Pearl River Mouth Basin is well analyzed through seismic data and drilling data,and control of tectonic evolution on hydrocarbon accumulation is also discussed.The results show that the central anticline zone in the Lufeng 13 sag develops the upper deformation layer and lower deformation layer.The“arched graben system”is developed in the upper deformation layer,and the magmatic diapir structure and flowing deformation of plastic strata is developed in the lower deformation layer.The evolution process of the central anticline zone can be divided into four stages,i.e.fault block uplifting stage,prototype stage,strengthening stage and finalization stage.The geological framework and tectonic evolution of the central anticline zone control Paleogene hydrocarbon accumulation.The Paleogene twolayer geological framework is favorable for development of structural traps and composite traps;the paleostructure highs are the direction of hydrocarbon migration,and the gravitational gliding faults are the main carrier bed for vertical hydrocarbon migration;the tectonic uplift is a key factor for reservoir diagenesis improvement and preservation of primary pores,and also controls distribution of high-quality reservoirs.

不同贮藏年份禄丰香醋细菌多样性分析

采用高通量测序技术对4个不同贮藏年份(2017、2018、2019、2020年)禄丰香醋的细菌多样性进行分析测定。结果表明,不同贮藏年份样品中的细菌菌群组成差别较大;2017、2018、2019年的细菌菌群多样性更高,主要优势菌门分别为厚壁菌门(Firmicutes)、变形菌门(Proteobacteria)、放线菌门(Actinobacteriota);优势细菌属主要为草螺菌属(Herbaspirillum)、不动杆菌属(Acinetobacter)、肥杆菌属(Hafnia-Obesumbacterium)、肠杆菌属(Enterobacter)、包西氏菌属(Bosea)。而2020年的优势菌门主要为厚壁菌门(Firmicutes)、变形菌门(Proteobacteria);优势细菌属主要为乳杆菌(Lactobacillus)、罗尔斯通氏菌(Ralstonia)、乳酸杆菌(Lactobacillus_homohiochii)。线性判别分析效应大小分析和相关性分析都表明细菌菌群的多样性与贮藏时间有关,京都基因与基因组百科全书预测分析表明,禄丰香醋中的有益菌群在初级代谢与次级代谢之间起着重要作用,之后可以进一步深入研究。本研究发现了不同贮藏年份禄丰香醋中细菌菌群多样性的变化,为禄丰香醋细菌多样性分析、优质菌种资源选育及发酵食醋工业化生产奠定了基础。

陆丰油田古近系低渗高温深层储层自源闭式强化注水技术研究与应用

受海上平台空间、作业成本、注水水源、施工工艺等条件限制,如何高效注水开发陆丰油田古近系低渗高温深层储层面临挑战。以陆丰油田古近系储层试验井为例,开展了注水可行性分析,优选了合适的水源层位和注入层;采用了同井自源类水层补充地层能量的自源闭式注水工艺,研发的配套配水器可满足调节扭矩≤5 N·m、耐压差35 MPa,测调仪器可满足耐温175℃、耐压60 MPa的性能要求,实现了海上平台深层一井多用、无须地面设备的注水新方式;采用了电缆传输的爆燃压裂工艺,实现快速、高效作业,措施的时间控制在14 h以内,时效提高10倍以上,火药密度超过6 kg/m;通过强溶缓速酸酸化复合增效。自源闭式强化注水技术已在陆丰油田试验井M10井取得成功应用,注水高效,受效井增产降水效果明显。本文研究成果有效拓展了注水技术在低渗、深层、高温储层中的应用,可为类似储层规模开发提供借鉴。

珠江口盆地陆丰凹陷古近系储层特征及优质储层主控因素

随着珠江口盆地勘探层系由浅层转向深层,古近系已成为陆丰凹陷油气“增储上产”的重要层系,但储层尚存在非均质性较强、产能释放难度大等问题,严重制约油气勘探进程。综合运用陆丰凹陷36口古近系钻井的铸体薄片、扫描电镜、物性分析、X衍射等分析化验数据,对文昌组和恩平组开展储层特征、成岩作用和优质储层主控因素研究。结果表明,陆丰凹陷古近系储层具有高石英、低长石和低岩屑含量的特征,文昌组主要发育岩屑石英砂岩,为特低-低孔隙度、超低-低渗透率储层,平均孔隙度为11.15%,平均渗透率10.93×10-3μm2;恩平组主要发育长石石英砂岩,为低-中孔隙度、特低-中渗透率储层,平均孔隙度为15.23%,平均渗透率为139.53×10-3μm2;储层孔隙类型以原生粒间孔为主,其次为粒间溶孔和粒内溶孔,但文昌组溶蚀孔占比高。古近系储层主要处于中成岩阶段A期,压实作用对减孔起决定性作用,胶结作用降低储层物性,溶蚀作用进一步改善储层物性。陆丰凹陷古近系优质储层形成条件包括:(1)母岩区石英含量高,搬运距离较远,高成分和结构成熟度,杂基含量低,单层砂体厚度大;(2)强流体改造改善储集空间,长石溶蚀对古近系尤其是文昌组储层改善明显,拥有良好断裂沟通源岩或临近源岩的砂岩储层溶蚀作用强;(3)凝灰质充填导致储层渗透率降低,低火山活动影响区更有利于优质储层发育。

珠江口盆地陆丰凹陷文昌组凝灰质砂岩储层成岩相及发育模式

陆丰凹陷文昌组深层砂岩储层是珠江口盆地珠一坳陷最重要的油藏储集岩之一,而凝灰质发育导致储层致密,渗透率呈现低渗、特低渗特征。由于凝灰质影响,该区成岩作用及其展布表现出特殊性。运用偏光显微镜在对凝灰质砂岩储层的成岩作用、自生矿物转化及孔隙类型详细观察的基础上,结合扫描电镜、孔渗测试及测井资料分析,对陆丰凹陷文昌组凝灰质砂岩储层成岩相及其发育模式进行了研究。结果表明,凝灰质蚀变作用是影响储层物性的主要成岩作用,其次是压实作用和溶蚀作用。依据各种成岩作用强度及其组合,储层整体可以分为5种成岩相:①中压实--弱胶结--凝灰质中等溶解相(Ⅰ类);②中强压实--弱胶结--凝灰质强溶解相(Ⅱ类);③中强压实--磷灰石中强胶结--中等溶解相(Ⅲ类);④中强压实--高岭石中强胶结--弱溶解相(Ⅳ类)和⑤强压实--弱胶结--弱溶解相(Ⅴ类)。其中Ⅰ类成岩相为优质成岩相(孔隙度均值为13.4%、渗透率均值为5.4×10^(-3)μm^(2)),Ⅱ类成岩相为有利成岩相(孔隙度均值为15.4%、渗透率均值为1.5×10^(-3)μm^(2)),Ⅲ类和Ⅳ类成岩相为潜在有利成岩相(孔隙度均值为15.0%、渗透率均值为1.0×10^(-3)μm^(2)),Ⅴ类成岩相为不利成岩相。受大气水淋滤和有机酸溶蚀等影响,陆丰凹陷文昌组深层砂岩储层主要发育Ⅱ-Ⅲ-Ⅳ-Ⅴ和Ⅰ-Ⅴ两种成岩相组合模式。成岩相与储层质量密切相关,通过识别优质成岩相可以预测有利储层分布,为油气勘探提供地质依据。

珠江口盆地陆丰12-A油田“断-脊-盖”耦合远源成藏模式

珠江口盆地陆丰凹陷历经40年勘探,发现了10余个商业油藏,其中大多数油藏分布于生烃中心15 km范围内,而远源目标的成藏主控因素复杂,取得勘探发现的难度较大。陆丰12-A油田与其生烃洼陷陆丰15洼的水平距离长达28 km,是迄今为止陆丰地区已知的油气运移距离最远的、主力油层全充满的商业性油藏。通过构造、沉积、成藏综合分析,对陆丰12-A油田的成藏模式进行解剖,研究表明,在油气运移路径上“油源断裂-构造脊-致密盖层”耦合关系好,使油气得以长距离运聚成藏。其中,成藏期活动的油源断裂是油气垂向运移的关键,古隆起与构造脊是油气侧向汇聚的有利方向,稳定分布的致密盖层是油气远源成藏的保障。该油田的发现大大拓展了陆丰凹陷的勘探边界,对其长距离运聚成藏的研究在陆相盆地远源勘探实践中具有一定的借鉴意义。