Influences of burial process on diagenesis and high-quality reservoir development of deep-ultra-deep clastic rocks:A case study of Lower Cretaceous Qingshuihe Formation in southern margin of Junggar Basin,NW China

Taking the Lower Cretaceous Qingshuihe Formation in the southern margin of Junggar Basin as an example,the influences of the burial process in a foreland basin on the diagenesis and the development of high-quality reservoirs of deep and ultra-deep clastic rocks were investigated using thin section,scanning electron microscope,electron probe,stable isotopic composition and fluid inclusion data.The Qingshuihe Formation went through four burial stages of slow shallow burial,tectonic uplift,progressive deep burial and rapid deep burial successively.The stages of slow shallow burial and tectonic uplift not only can alleviate the mechanical compaction of grains,but also can maintain an open diagenetic system in the reservoirs for a long time,which promotes the dissolution of soluble components by meteoric freshwater and inhibits the precipitation of dissolution products in the reservoirs.The late rapid deep burial process contributed to the development of fluid overpressure,which effectively inhibits the destruction of primary pores by compaction and cementation.The fluid overpressure promotes the development of microfractures in the reservoir,which enhances the dissolution effect of organic acids.Based on the quantitative reconstruction of porosity evolution history,it is found that the long-term slow shallow burial and tectonic uplift processes make the greatest contribution to the development of deep-ultra-deep high-quality clastic rock reservoirs,followed by the late rapid deep burial process,and the progressive deep burial process has little contribution.

Evolution characteristics and exploration targets of Permian clastic rock reservoirs in Bohai Bay Basin,East China

Based on core observation, thin section examination, fluid inclusions analysis, carbon and oxygen isotopic composition analysis, and other approaches, the structural and burial evolution histories were investigated, and the diagenetic evolution process and genetic/development models were systematically discussed of the Upper Paleozoic Permian clastic rock reservoirs in the Bohai Bay Basin, East China. The Bohai Bay Basin underwent three stages of burial and two stages of uplifting in the Upper Paleozoic. Consequently, three stages of acid dissolution generated by the thermal evolution of kerogen, and two stages of meteoric freshwater leaching occurred. Dissolution in deeply buried, nearly closed diagenetic system was associated with the precipitation of authigenic clay and quartz, leading to a limited increase in storage space. Different structural uplifting–subsidence processes of tectonic zones resulted in varying diagenetic–reservoir-forming processes of the Permian clastic reservoirs. Three genetic models of reservoirs are recognized. The Model I reservoirs with pores formed in shallow strata and buried in shallow to medium strata underwent two stages of exposure to long-term open environment and two stages of meteoric freshwater leaching to enhance pores near the surface, and were shallowly buried in the late stage, exhibiting the dominance of secondary pores and the best physical properties. The Model Ⅱ reservoirs with pores formed in shallow strata and preserved due to modification after deep burial experienced an early exposure-open to late burial-closed environment, where pore types were modified due to dissolution, exhibiting the dominance of numerous secondary solution pores in feldspar and the physical properties inferior to Model I. The Model Ⅲ reservoirs with pores formed after being regulated after multiple periods of burial and dissolution experienced a dissolution of acidic fluids of organic origin under a near-closed to closed environment, exhibiting the dominance of intercrystalline micropores in kaolinite and the poorest physical properties. The target reservoirs lied in the waterflood area in the geological period of meteoric freshwater leaching, and are now the Model Ⅱ deep reservoirs in the slope zone–depression zone. They are determined as favorable options for subsequent exploration.

Experimental investigation of creep behavior of clastic rock in Xiangjiaba Hydropower Project

There are many fracture zones crossing the dam foundation of the Xiangjiaba Hydropower Project in southwestern China. Clastic rock is the main media of the fracture zone and has poor physical and mechanical properties. In order to investigate the creep behavior of clastic rock, triaxial creep tests were conducted using a rock servo-controlling rheological testing machine. The results show that the creep behavior of clastic rock is significant at a high level of deviatoric stress, and less time-dependent deformation occurs at high confining pressure. Based on the creep test results, the relationship between axial strain and time under different confining pressures was investigated, and the relationship between axial strain rate and deviatoric stress was also discussed. The strain rate increases rapidly, and the rock sample fails eventually under high deviatoric stress. Moreover, the creep failure mechanism under different confining pressures was analyzed. The main failure mechanism of clastic rock is plastic shear, accompanied by a significant compression and ductile dilatancy. On the other band, with the determined parameters, the Burgers creep model was used to fit the creep curves. The results indicate that the Burgers model can exactly describe the creep behavior of clastic rock in the Xiangjiaba Hydropower Project.

Sedimentology and Chronology of Paleogene Coarse Clastic Rocks in East-Central Tibet and Their Relationship to Early Tectonic Uplift

A systematic sedimentological and chronological study of typical Paleogene basins in eastcentral Tibet suggests that the depositional characteristics of extensively developed huge-bedded, purplish-red coarse clastic rocks formed in a tectonic setting of regional thrusting and strike-slipping represent a typical dry and hot subaerial alluvial fan environment formed in a proximal and rapidaccumulating sediment body in debris flows and a fan-surface braided river. Combining results from basin-fill sequences, sequences of coarse clastic rocks, fauna and sporo-pollen associations and thermochronological data, it is conduded that the coarse clastic rocks formed in the period of 54.2- 24.1 Ma, nearly coeval with the formation of Paleogene basins in the northern （Nangqen-Yushu thrust belt）, middle （Batang-Lijiang fault belt）, and disintegration of large basins in the southern （LanpingSimao fold belt） segments of Tibet. The widespread massive-bedded coarse clastic rocks, fold thrusting and strike-slip, thrust shortening, and igneous activities in the Paleogene basins of eastcentral Tibet indicate that an early diachronous tectonic uplift might have occurred in the Tibetan Plateau from Middle Eocene to Oligocene, related to the initial stage of collision of the Indian and Asian plates.

Reservoir Characteristics and Assessment of Clastic Rock Reservoir in the North Biru Basin

At present,the main clastic rock reservoirs discovered in north Biru Basin are Xihu Formation, Lagongtang Formation,Duoni Formation and Jingzhushan Formation.Through the studies on petrology, reservoir properties and diagenesis,it is concluded that diagenesis of these four layers are strong,most have entered the late diagenesis period.The main type of reservoir space is secondary-hole solution and the pore structure is micro-fine pore and micro

A Study on Organic Inclusions in Clastic Reservoir Rocks and Their Application to the Assessment of Oil and Gas Accumulations

Terrigenous clastic reservoir rocks are widespread in China, and nearly all the industrial oil and gas accumulations in eastern China occur in the clastic rocks. The study shows that organic inclusions are mostly distributed in the secondary fissures and pores which were formed in the process of oil-rock interaction, rather than in the cements or secondary enlargements.The organic inclusions are dominantly organic gas-rich or are composed of pure hydrocarbons.Homogenization temperatures range mainly from 120℃ to 130℃, which shows a relatively high maturity of organic matter. Vertical and horizontal temperature changes provide the grounds for the investigation of hasin evolution and thermal fluid-kinetics model. Fluorescence spectral characteristics of the organic inclusions indicate that oils and gases in the area studied probably have experienced two-stage or two-time migration. Micro-fluorescence research is one of the effective approaches to oil/source correlation and oil migration-stage determination. The abundance and occurrence of organic inclusions is one of the indicators of oil and gas abundance and accumulation in rock layers. With the help of other information, organic inclusions can provide the basis for the prospective assessment of oil and gas in clastic reservoir rocks.

综合物探方法在碎屑岩地区找水中的应用——以云南宣威大路边村为例

为探索地球物理方法在碎屑地区找水应用的有效性,文章以云南宣威大路边村为研究对象,选取高密度电阻率法、联合剖面法、音频大地电磁法对碎屑岩层进行找水研究。结果表明:三叠系上统飞仙关组(T1f)碎屑岩富水性中等,含水性较均匀;受地面场地狭窄限制,高密度电法及联合剖面法测线长度有限,探测深度较浅,受碎屑岩电阻率小的影响,其找水应用效果不佳,在可探测的深度范围内较难识别基岩裂隙等找水有效异常,需结合其他物探方法甄别异常;音频大地电磁法找水应用效果相对较好,具有较高的横向分辨率,可有效识别碎屑岩中的断裂破碎带及构造裂隙带,表现为相对低阻异常特征;视电阻率单支测深曲线能有效分辨不同深度的岩土层结构,具有较高的纵向分辨率,对裂隙破碎带有较好指示意义。在地面场地较为狭窄的碎屑岩地区开展找水工作,音频大地电磁法结合视电阻单支测深曲线能取得较好效果,以音频大地电磁法确定碎屑岩地区中的裂隙发育带位置,以视电阻单支测深曲线确定裂隙发育带的深度。

滇西昌宁-孟连带二叠纪碎屑岩地层:存在问题和研究进展

滇西的昌宁-孟连带被认为是古特提斯在该地区的遗迹,对研究古特提斯的演化意义重大。然而,该带中不同来源的地层单元或层序片段之间的关系非常复杂,既有时代相同而岩性迥异的层段,也有时代不同而岩性相近的层段,在很大程度上影响了人们对古特提斯演化的深入了解。一些早期建立的岩组,受露头较差、构造复杂、大化石稀少等具体条件的限制,对其所含内容的定义比较粗略,包含了不同时代、不同环境形成的岩石层段。这种情况尤以当初划归二叠系的碎屑岩地层为甚。本文对1980年代1∶20万地质填图时建立的涉及二叠纪碎屑岩地层的岩组,即中北部耿马—沧源一带的南皮河组和南部澜沧—孟连一带的拉巴组,进行了解析,并结合笔者近年来所获得的化石、沉积岩石学、碎屑锆石年龄等材料和数据、以及大量的野外观察,梳理了两个岩组所包括的不同时代和岩性的岩片,重新厘定了南皮河组的内含,论述了拉巴组为何不宜再作为一个岩组使用,并建议对拉巴组所包含的在区域上可识别的岩片,可在进一步深入研究后再予以慎重命名。

陆相湖盆水下喷发火山岩储层特征及发育模式——以松辽盆地长岭断陷查干花次凹为例

在松辽盆地长岭断陷陆相湖盆水下喷发的火石岭组火山碎屑岩中发现了工业油气,有广阔的勘探前景。研究针对火石岭组水下喷发火山碎屑岩储层的储集空间特征、物性特征及孔隙结构差异开展,分析不同类型储层物性差异原因及其形成和演化过程。主要有以下4个方面:①凝灰岩中火山玻璃含量较高,储集空间以脱玻化孔和溶蚀孔为主,并且粒度越粗物性越好,孔隙规模、孔径大小、孔隙丰度等方面逐渐变大;沉凝灰岩黏土矿物含量高,以黏土矿物晶间孔为主,物性差;凝灰质砂岩中长石、岩屑和浊沸石等易溶组分含量高,以溶蚀孔为主。②研究区火山碎屑岩储层原生孔隙不发育,储层较为致密,平均孔隙度为2.43%,渗透率平均值为0.076×10^(-3)μm^(2),粗粒凝灰岩孔隙度最高,其次是凝灰质砂岩和细粒凝灰岩,沉凝灰岩物性最差。③脱玻化作用是凝灰岩储层中高孔隙度和超低渗透率的重要原因,中成岩阶段的2次油气充注导致岩石发生有机酸溶蚀,此外,裂缝可以为有机酸和深部热液提供运移通道,导致后期溶蚀,并连接各种分散的溶蚀孔隙,提高储集空间的有效性。④近源相带气携水下火山碎屑流亚相粗粒凝灰岩储层是油气勘探的有利目标。

山西黎城地区长城系沉积时代及源区分析:碎屑锆石U-Pb年代学和Lu-Hf同位素证据

长城系是华北克拉通统一结晶基底形成后的首套沉积盖层,其碎屑锆石U-Pb年代学及其Hf同位素特征分析对探讨地层形成时代、源区特征以及基底演化均具重要研究意义。本文对华北克拉通中部黎城地区长城系下部地层的碎屑锆石进行了U-Pb年龄和Hf同位素分析。结果表明,该区长城系碎屑锆石U-Pb年龄呈现了2.55~2.45Ga、2.15~2.0Ga和~1.92Ga等三个主峰期,同时存在3.5~3.1Ga和2.9~2.7Ga的年龄次峰期。最年轻碎屑锆石的207 Pb/206 Pb加权平均年龄限定了该区长城系沉积发生于1.76Ga之后。碎屑锆石的年龄分布和Hf同位素特征与华北克拉通中、南部基底物质记录的地质事件高度相似,区内长城系地层与南部熊耳地区长城系地层可对比性强,证明太行山南段在1.76Ga后已与南部熊耳裂谷盆地相连,其沉积物质均主要来自华北克拉通中、南部地区。其中,3.5~3.4Ga的古老碎屑锆石εHf(t)=-8.6~-4.6,揭示中、南部地区存在古太古代地壳物质。新太古代早期2.9~2.7Ga的锆石εHf(t)以正值为主(占比85%),它们的t C DM=3190~2774Ma,与其结晶年龄相同或接近,证明华北克拉通南部在新太古代早期以新生地壳生长为主。新太古代晚期2.55~2.45Ga峰期的锆石也以正的εHf(t)值为主(占比69%),而2.15~2.0Ga峰期锆石的εHf(t)值大多偏负(占比56%),说明华北克拉通南部地区从新太古代末期的新生地壳增生为主伴有陆壳再造转变为古元古代中期以古老陆壳物质再造为主,并有少量新生陆壳增生;古元古代晚期~1.92Ga年龄峰期的碎屑锆石εHf(t)=-11.9~+2.0,揭示至古元古代末期华北克拉通中南部进入到以古老陆壳物质再造为主的演化阶段。

松辽盆地南部大情字井区青山口组地热水化学特征及成因模式

位于长岭凹陷鞍部的大情字井地区水热型地热资源丰富,其中储层温度较高、岩性好、含水量高的青山口组是最佳热储层,因此,阐明地热水的成因模式对于该区地热资源的可持续开发利用具有重要意义。通过青山口组7口井地热水样的水化学测试,结合收集的8组氢氧同位素数据,研究了目标区地热水的来源及混合过程,并分析了成因模式。结果表明,青山口组地热水主要为部分平衡的Cl^(-)Na型流体,补给来源为长白山地区的大气降水和原生沉积水,补给高程为2347~2370 m;通过2210~3470 m的循环吸热过程形成现今温度为81.25~112.80℃的地热流体存储于半开放体系的青山口组碎屑岩储层中。另外,研究区NE、NW向2组断裂系统是地热流体循环的主要导水通道,地热流体在深循环过程中与围岩矿物发生水岩反应,碳酸盐岩及硅酸盐矿物的溶解,形成了以Na^(+)、Cl^(-)和HCO^(-)3离子为主的地热水资源。

基于数据融合的无人机影像碎屑岩岩性识别

不同类型岩性影像纹理相似性高,基于单一的二维影像进行岩性识别精度较低。针对这一问题,开展了顾及影像深度信息的岩性智能识别方法研究。利用无人机影像具有多模态的特性,采用通道叠加、IHS(intensity,hue,saturation)变换、小波变换以及多模态融合4种影像融合方式,将深度信息融入影像数据中,运用深度卷积神经网络DeepLabv3+进行碎屑岩岩性识别。经人工解译结果对比分析,结果表明:实验区内基于多模态融合影像的岩性识别精度最高,Kappa系数可达76.17%,总体识别精度可提升到91.05%;分析认为,顾及影像深度信息的岩性智能识别方法针对岩层表面不平整,高差落差大的砾岩识别效果有明显提升,但表面平整、高差表现不明显的泥岩和砂岩地层识别效果有待提升。研究成果为野外碎屑岩露头岩性快速识别提供了新思路。

埋藏过程对深层-超深层碎屑岩成岩作用及优质储层发育的影响——以准噶尔盆地南缘下白垩统清水河组为例

以准噶尔盆地南缘下白垩统清水河组为例,综合利用岩石薄片、扫描电镜、电子探针、稳定同位素组成及流体包裹体等技术手段,开展前陆盆地埋藏过程对深层—超深层碎屑岩成岩作用及优质储层发育影响的研究。研究表明,清水河组依次经历了“缓慢浅埋”、“构造抬升”、“渐进深埋”与“快速深埋”4个埋藏阶段。“缓慢浅埋”与“构造抬升”不仅能够缓解储层颗粒间的机械压实作用,还有利于长期保持开放型的成岩体系;既能够促进大气淡水对储层易溶组分的充分溶解,还能够抑制溶蚀产物的沉淀。晚期“快速深埋”过程促成流体超压的发育,一方面有效地抑制压实、胶结作用对原生孔隙的破坏,另一方面也促进储层微裂缝的大量发育,提高了晚期有机酸充注产生的溶蚀效果。基于孔隙度演化史的定量恢复,证实长期“缓慢浅埋”与“构造抬升”过程对深层—超深层优质碎屑岩储层发育的贡献最大,其次为晚期“快速深埋”过程,“渐进深埋”过程则几乎没有贡献。

Analysis of petrophysical cutoffs of reservoir intervals with production capacity and with accumulation capacity in clastic reservoirs

Methodologies have been developed for calculating cutoffs of reservoir intervals with production capacity （RIPC） and reservoir intervals with accumulation capacity （RIAC） according to the types of pore throat structures and dynamic force by using data from petrophysical analysis, production tests and mercury injection. The data are from clastic reservoirs in the third member （Es3） and the fourth member （Es4） of the Shahejie Formation in the Shengtuo area on the North Slope of the Dongying Sag, Jiyang Depression, China. The method of calculating cutoffs of RIPC is summarized as follows： 1） determination of permeability cutoffs of RIPC; 2） classification of types of pore-throat structures according to mercury injection data and then relating porosity to permeability and determining the relationship between porosity and permeability according to each type of pore-throat structure; and 3） calculating porosity cutoffs of RIPC using established correlation between porosity and permeability according to the type of pore throat structure. The method of calculating cutoffs of RIAC includes： 1） establishing a functional relationship between oil-water interracial tension and formation temperature; 2） calculating limiting values of maximum connected pore-throat radii according to formation temperature and dynamic forces of each reservoir interval; 3） correlating permeability with maximum connected pore-throat radius and then obtaining permeability cutoffs of RIAC; and 4） calculating porosity cutoffs on the basis of permeability cutoffs according to specific correlations, suitable for the type of porethroat structure. The results of this study show that porosity and permeability cutoffs of clastic reservoirs decrease with depth. For a fixed permeability cutoff, the porosity cutoff of R1PC varies because the type of pore throat is different. At a fixed temperature, porosity and permeability cutoffs of RIAC decrease as dynamic force increases. For a fixed permeability cutoff of effective hydrocarbon accumulation, the porosity cutoff also varies with different types of pore throat.

桂北龙胜浅变质碎屑岩中金矿属于造山型金矿

桂北地区金矿资源丰富,已发现金矿床(点)70多处,但面临“只见星星不见月亮”的尴尬处境。2020~2022年,申请者及其团队对桂北龙胜大地金矿开展普查、详查工作,矿床规模达到中型以上,是桂北金矿找矿重要的窗口和突破口。桂北龙胜地区位于江南造山带的西南端,是湘黔桂金三角重要组成部分。近年来,在黔东南和湘西地区陆续发现造山型金矿(文静等,2022;陈军等,2023)。

贵州碎屑岩分布区崩塌地质灾害发育特征及孕灾条件分析

碎屑岩分布区地质灾害以滑坡为主,而崩塌地质灾害往往容易被忽视。通过对碎屑岩崩塌孕育条件的分析,可以更好地指导碎屑岩分布区崩塌的防治工作。本文以云贵山崩塌为例,运用地面调查、遥感、数值模拟等技术手段,分析其地质灾害特征、运动特征及孕育条件。采用归纳分析的方法对碎屑岩崩塌孕灾条件进行了总结。结论显示,云贵山崩塌为小型崩塌,破坏模式多为倾倒式,影响范围112 m以内;陡峭的地形、硬岩夹软弱夹层组合、近水平斜坡结构、差异性风化是云贵山崩塌的主要孕育条件;碎屑岩崩塌孕灾条件中地形地貌、特殊岩性组合及软硬岩接触面的揭露情况对碎屑岩崩塌孕育的影响较大。

湖北省三峡库区砂泥岩互层岩体劣化特征与劣化机理分析

受水位周期性变动影响,三峡库区地质环境产生复杂变化,尤其是对碎屑岩岸坡砂泥岩互层岩体劣化的影响显著。本文通过对湖北省三峡库区碎屑岩岸坡砂泥岩互层岩体进行现场调查,结合现场测试与室内试验成果,对比分析碎屑岩砂泥岩互层岩体两种结构单元的劣化差异,结合岸坡互层岩体的劣化现状,分析砂泥岩互层结构的岸坡岩体劣化变形过程,揭示砂泥岩互层岩体的劣化机理及其对岸坡致灾发展的影响,为后期合理进行岸坡岩体劣化评价及防治提供理论支撑。

准噶尔盆地腹部深层—超深层碎屑岩储层发育特征与孔隙演化定量表征

腹部下组合(二叠系—三叠系)是准噶尔盆地油气勘探重要的战略接替领域。多井钻揭6 km以下优质碎屑岩储层,大大突破了传统碎屑岩有效储层埋深下限,明确储层发育状况及孔隙演化过程是确定油气能否富集成藏的关键问题。以腹部地区典型钻井为例,综合岩石薄片镜下分析、孔渗测试、图像分析技术、孔隙度演化定量表征及包裹体测温和盆地模拟等方法,从定性和定量的角度全面剖析准噶尔盆地腹部下组合深层—超深层碎屑岩储层的岩石学、物性及孔隙结构特征,并定量恢复孔隙演化过程。结果表明,腹部下组合中三叠系百口泉组砂体最为发育,二叠系上乌尔禾组及三叠系克拉玛依组次之;各层位岩石类型均以岩屑砂岩为主,少量长石岩屑砂岩,岩屑成分主要为中—基性火山岩屑,长石、石英含量偏低,二者之和普遍低于20%;克拉玛依组原生孔隙发育,物性最好,孔隙度最高可达13.18%。上乌尔禾组和百口泉组以次生溶蚀孔为主,溶蚀物质主要为中—基性火山岩屑、浊沸石胶结物及少量长石,二者物性较其上覆克拉玛依组差;克拉玛依组孔隙演化经历较弱压实(压实减孔量21.08%)、弱胶结(胶结减孔量2.88%)和弱溶蚀(溶蚀增孔量1.4%),现今高孔隙度主要得益于弱压实、晚期弱胶结作用下原生孔隙的大量保存;百口泉组和上乌尔禾组经历强压实(压实减孔量分别为26.60%和26.43%)、强胶结(胶结减孔量分别为7.43%和11%)和中等—强溶蚀(溶蚀增孔量分别为6.32%和4.21%),溶蚀作用是二者增孔的最主要途径,但不足以弥补强压实和强胶结的减孔效应,导致二者现今孔隙度较低。

三峡库区秭归碎屑岩岸坡消落带岩体劣化特性研究

岸坡消落带岩体劣化对岸稳定性演化和岸坡再造具有不利影响.三峡库区岸坡消落带长期处于145~175 m库水位升降环境,以三峡库区碎屑岩岸坡消落带岩体为研究对象,采取野外调查与测绘、室内试验、消落带岩体与未受库水位影响的自然风化区岩体的“比拟法”等综合方法,总结了碎屑岩岸坡消落带岩体劣化特征,基于消落带岩体劣化宏观现象,提出了碎屑岩岸坡消落带岩体的劣化模式,分析了碎屑岩岸坡消落带岩体劣化水动力作用机制.结果表明:岸坡消落带岩体劣化与岸坡结构、工程地质岩组和岩性具有明显的相关性.库水位升降水动力作用是诱发消落带岩体劣化的主要水动力条件.

渤海湾盆地二叠系碎屑岩储集层发育演化特征与勘探方向

基于岩心观察、薄片鉴定、流体包裹体分析、碳氧同位素组成分析等技术方法,结合构造和埋藏演化史,系统分析渤海湾盆地上古生界二叠系碎屑岩储集层成岩演化过程、储集层成因及发育模式。研究表明:①渤海湾盆地上古生界整体经历3期埋藏和2期抬升过程,相应地发生3期干酪根热演化生酸溶蚀成孔和2期大气淡水淋滤成孔过程,深埋条件下近封闭成岩体系中溶蚀作用伴随自生黏土和石英沉淀,储集空间增加有限;②不同构造带差异性构造抬升—沉降过程造成二叠系碎屑岩储集层成岩-成储过程的差异性,并发育3类不同的储集层成因模式:Ⅰ类浅层成孔-中浅埋藏型储集层经历两期暴露—长期开放环境,于近地表经历两期大气水淋滤增孔作用,晚期浅埋,次生孔隙为主,物性最好;Ⅱ类浅层成孔-深埋调配保孔型储集层经历早期暴露开放—晚期埋藏封闭环境,溶蚀作用调配孔隙类型,以大量长石次生溶孔为主,物性次之;Ⅲ类多期埋藏溶蚀调配成孔型储集层经历近封闭—封闭环境下有机来源酸性流体溶蚀,以高岭石晶间微孔隙为主,物性最差。地质历史时期为大气水淋滤注水区,而现今位于斜坡带—洼陷带的Ⅱ类深埋储集层,为下步有利勘探目标。