Formation conditions and reservoir-forming models of the Ordovician buried hill reservoirs in the Jizhong depression

The buried hill in the Jizhong depression contains abundant petroleum reserves and are important production areas.The Ordovician buried hill has restricted the discovery of new oil and gas exploration targets because of its strong reservoir heterogeneity and complex reservoir-controlling factors.Based on a large volume of core,thin section,logging,seismic,and geochemical data and numerous geological analyses,the reservoir-forming conditions and modes were systematically analyzed to guide the exploration and achieve important breakthroughs in the Yangshuiwu and Wen an slope buried hills.The study revealed that three sets of source rocks of the third and fourth members of the Shahejie Formation from the Paleogene and Carboniferous-Permian were developed in the Jizhong depression,providing sufficient material basis for the formation of buried hill oil and gas reservoirs.The reservoir control mechanism involving the three major factors of“cloud-karst-fault”was clarified,and karst cave,fracture fissure-pore,and cloud pore type reservoir models were established,thereby expanding the exploration potential.Controlled by the superposition of multi-stage tectonic processes during the Indosinian,Yanshanian,and Himalayan,two genetic buried hill trap types of uplift-depression and depression-uplift were formed.Based on the analysis of reservoir-forming factors of the Ordovician buried hill,three buried hill oil and gas reservoir-forming models were identified:low-level tectonic-lithologic composite quasi-layered buried hill,medium-level paleo-storage paleo-block buried hill,and high-level paleo-storage new-block buried hill.Comprehensive evaluations indicate that the reservoir-forming conditions of the low-level tectonic-lithologic composite quasi-layered buried hill in the northern portion of the Jizhong depression are the most favorable and that the Sicundian and Xinzhen buried hills are favorable areas for future exploration.

Inversion of breakout data from inclined boreholes for stress state of the upper crust in Jizhong depression

The forward and inverse problems of studying crustal stress state from breakout data of inclined boreholes are concisely stated. direction of the maximum horizontal principal stress (compressive) and relative magnitudes of the horizontal stresses to the vertical stress in the upper crust in two regions of the Jizhong depression, the North of China, are obtained by analyzing the breakout data of 6 inclined wells. To get stable results in the analysis wesearched for the unknown parameters both forwardly and inversely. The results show that the maximum azimuths of the horizontal Principal compressive stresses in the central and southern part of the Jizhong depressionare N86°E and N77°E, respeCtively, while the relative magnitudes of the three principal stresses in the uppercrust (about 1000-4000 m) of the depression are variable. In the centra; part of the Jizhong depression we havefound SH : Sv: SK= 1. 38: 1. 00: 0. 57, where SH, SV and Sh are the maximum horizontal, vertical and minimum horizontal stress, resistively. This indicates that the present stress regime in this area is of strike-slipfaulting type. In the southern part of the depreSSion we have obtained SH: Sv: Sh=0. 80: 1. 00 1 0. 62, indicating a normal faulting stress regime in the shallow Part Of the crust.

Reservoir controlling differences between consequent faults and antithetic faults in slope area outside of source: A case study of the south-central Wenan slope of Jizhong Depression, Bohai Bay Basin, East China

The control effects of different occurrence faults on oil and gas accumulation and distribution in the outer slope area of oil and gas reservoirs were studied taking the south-central Wen’an slope of the Jizhong depression in the Bohai Bay Basin as an example.Based on 3D seismic data and the distribution of oil and water,the controlling differences between consequent fault and antithetic fault were analyzed and compared from the formation and evolution rule of faults and the formation mechanism of fault traps,including development positions of the consequent fault traps and antithetic fault traps,oil and gas distribution horizon adjusted by fault and formation period of fault traps.The differences between consequent faults and antithetic faults in controlling reservoirs have three main aspects:(1)Consequent fault traps and antithetic fault traps are in different positions,the consequent fault traps are at the segmented growing point in the hanging wall of"hard-linkage"faults,while the antithetic fault traps are developed in the position with the largest throw in the footwall because of tilting action;(2)The two kinds of faults result in different oil and gas distribution vertically,oil and gas adjusted by consequent faults is distributed in a single layer or multi-layers,while oil and gas adjusted by antithetic faults occur in single layers;(3)The two kinds of fault traps are formed in different periods,the consequent fault traps are formed at the time when the related faults enter the stage of"hard-linkage",while the antithetic fault traps are formed at the beginning of the fault active period.

Hengshui—A Pearl Embedded in Jizhong Plain

Situated in the Heilonggang Area of Southern Hebei Province, Hengshui City is the center of politics, economy and culture of Hengshui Prefecture, with a total area of 598 sq km and a population of 350,000. Since 1982, when Hengshui was approved to be built into a city, its economy has been growing rapidly. Now, annual GNP has topped RMB1.9059 billion, total industry and agriculture output value RMB 3.529 billion, and financial income RMB 176 million, putting it among the best in the province in composite economic index. Hengshui City stands in the

白乃庙-吉中造山带东段早古生代地层的识别及其地质意义

白乃庙-吉中造山带中的诸多前寒武纪地体是否属于同一个微陆块一直存在着争议,由此制约了对该造山带前寒武纪构造演化及其中微陆块基底构造亲缘性的认识。对造山带东段吉林南部头道沟组的野外观察及锆石U-Pb年代学研究表明,该地层形成时代为631~460Ma,是长春-延吉蛇绿混杂岩带的重要组成部分;白乃庙-吉中造山带东、西两段前寒武纪碎屑锆石年龄谱系和εHf(t)值均具有很好的相似性,同时造山带不同地区岩浆岩的锆石Hf同位素模式年龄和全岩Nd同位素年龄均具有很好的对应性,表明卷入该造山带的前寒武纪地体曾同属于一个微陆块;白乃庙-吉中造山带内的下古生界中存在大量泛非期碎屑锆石(~600Ma),结合造山带与冈瓦纳大陆的前寒武纪碎屑锆石年龄谱系和εHf(t)值的高度吻合性,我们认为该造山带中的微陆块可能来自于冈瓦纳大陆,但其在冈瓦纳大陆中的位置与中亚造山带东段的其他地块(额尔古纳、兴安及布列亚-佳木斯-兴凯地块)相距较远。

深地震反射剖面揭示沧县隆起和黄骅坳陷及邻区的地壳精细结构和构造特征

为研究华北盆地的地壳精细结构和断裂的深、浅构造关系,跨冀中坳陷、沧县隆起、黄骅坳陷和埕宁隆起完成了1条长约200km的深地震反射剖面和1条长66km的中-浅层地震反射剖面。结果表明,沿剖面地壳厚30~35km,且具有东薄西厚的分布特征,在冀中坳陷下方,莫霍面出现明显上隆,其隆起幅度为2~3km。研究区上地壳反射结构具有凹隆相间的展布特征,多条规模较大的断裂隐伏于华北盆地之下,对该区隆起和坳陷的形成与发展具有重要的控制作用。剖面上一系列与主断裂同向或反向的次级断裂将研究区的上地壳切割为多个次级小型地堑或半地堑断陷,导致整个华北盆地的上地壳结构复杂化。下地壳反射结构由一系列反射能量变化较大、横向上不能稳定成层、产状复杂多变的反射事件构成,这与反射能量强、横向连续性好及产状近水平展布的上地壳反射明显不同,暗示研究区上、下地壳物质有着明显不同的形成环境、变形方式和温压条件。中-浅层地震剖面和深地震反射剖面共同揭示的太行山山前断裂表现为一条低角度的大型铲形正断层,向下可与太行山东缘向E缓倾的大型滑脱构造(拆离断层)相联系;沧西断裂、沧东断裂和埕西断裂作为沧县隆起、黄骅坳陷、埕宁隆起的边界断裂,控制了该区堑、垒构造的形成与发展,是第四纪以来的隐伏活动断裂,推测其深部终止于深约18km的壳内解耦面上。文中研究结果可为进一步理解华北盆地的深部动力学过程及分析研究区深、浅断裂构造关系提供地震学依据。

冀中坳陷南部中—新生代构造转换及其油气地质意义

为了分析冀中坳陷南部中—新生代构造转换机制及其与油气分布的关系,基于地震解释资料,对该区地质结构特征、构造演化及构造转换过程进行研究,并对其油气地质意义进行了探讨。结果表明:冀中坳陷南部衡水调节带两侧地质结构存在明显差异,北部为“双断-双向滑脱-背倾半地堑”结构,南部为“多断-单向滑脱-复式半地堑”结构;冀中坳陷南部地区中—新生代构造演化大致分为基底演化(中生代)、初始裂陷演化(孔店组—沙四段沉积时期)、强裂陷演化(沙三段—沙二段沉积时期)、弱裂陷演化(沙一段—东营组沉积时期)及后裂陷演化(馆陶组沉积时期以来)5个阶段;冀中坳陷南部经历了基底NNE向构造体系向新生代NE向构造体系的转换,区域中—新生代以来应力场变化是冀中坳陷多方位复杂构造形成的原因;冀中坳陷南部构造转换作用通过影响洼槽迁移进而影响有效烃源岩分布,通过控制砂体入盆通道影响储层砂体展布,构造变换过程中主干断层位移梯度变化导致横向背斜形成指示油气富集的有利部位。构造体制转换形成的不同规模变换构造具有一定勘探潜力。

冀中坳陷区深部碳酸盐岩分布特征

前人研究表明冀中坳陷深部地热储层主要为蓟县系雾迷山组、长城系高于庄组碳酸盐岩地层,区内广泛分布的以黏土、砂岩、含砾砂岩为主的新生界地层为盖层,现今的地温梯度和大地热流具有从西向东先增大后降低的趋势,其平面展布与构造地形起伏具有一致性(常健等,2016)。因此研究由综合地球物理剖面解释推断(1)的碳酸盐岩分布特征,结合区内热储盖层、大地热流特征,有助于分析该区深部地热资源的赋存特征。

冀中坳陷岩溶热储地下水对流活动的聚热效应

地形起伏及浮力均可以驱动地下水流,在此过程中通过对流方式快速传递热量,进而改变温度分布模式,造成局部显著热异常,对岩溶储层地热资源聚敛有着重要意义.冀中坳陷岩溶热储发育,岩溶缝洞系统为地下水提供了良好的垂向和水平径流条件,形成了独特的对流-传导复合型地热系统.通过温度场、水动力场耦合数值模拟,本文聚焦冀中坳陷岩溶热储强迫对流和自由对流联合作用模式及其聚热效应.二维有限元数值模拟结果表明,在自由对流模型的基础上,地形驱动的强迫对流叠加作用使岩溶层内地下水流速显著增加.地形驱动流体可以推动自由对流单元向坡下滚动,强化了地下水对流的聚热效应.高阳凸起和献县凸起显著的热异常主要归因于岩溶储层和断裂带内地下水自由对流的传热效应,基底起伏造成的热流折射聚热效应是次要的.此外,地形驱动下,自由对流单元向流域下游方向推进可能是献县凸起较高阳凸起热异常更为显著的重要原因.

大地电磁测深法在冀中坳陷深部碳酸盐岩热储调查评价中的应用

地热资源作为一种清洁能源,在“双碳”背景下,其开发和利用越来越受到重视。为了探查渤海湾盆地的冀中坳陷深部碳酸盐岩的热储条件,笔者等利用3条大地电磁测深剖面,进行了数据处理、分析和反演,获得可靠的二维电阻率模型和电阻率等深度平面图。分析研究区深部电性结构特征及主要断裂构造特征,同时根据基底隆起形成的高阻异常对深部碳酸盐岩分布和埋深进行了推断,并对冀中坳陷深部碳酸盐岩热储进行评价,以圈定地热异常远景区。分析认为:①研究区电性结构可以被划分为5层,其中第5电性层为高阻标志层,对应深部碳酸盐岩基底;②据此圈定了3类深部地热远景区:基岩埋深小于4000 m,如高阳低凸起地热远景区、黑龙口低凸起地热远景区(徐水凹陷)和河间潜山地热远景区(饶阳凹陷),基岩埋深4000~5000 m,如雁翎潜山地热远景区(霸县凹陷),基岩埋深5000~5500 m,如肃宁潜山地热远景区和留路潜山地热远景区;③大地电磁测深方法适用于冀中坳陷深部碳酸盐岩热储远景区的探查。深部热储远景区的圈定,可为后期的地热资源评价和开发利用建立基础。

冀中笙管乐的空间范围及其文化区的演变

冀中笙管乐的空间范围大致为北京以南,天津以西,沧州、定州一线以北的近三十个县(市、区),分布形态呈现典型的核心-外围-过渡圈状结构。其文化区包含核心区、外围区和过渡区三部分。核心区十分稳定未发生过改变,外围区和过渡区呈现先扩张后收缩的变化趋势,其原因与传统的根植及环境的浸染密切相关。

探索冯纪忠先生中国传统园林史观与现代景观结合——以牛首山核心区景观设计为例

文章首先对冯纪忠先生的中国传统园林史研究成果进行概述,其次对研究成果中“形、情、理、神、意”五个发展层面进行分析,最后结合实际项目案例,探索冯纪忠先生中国传统园林史观与现代景观设计的结合。

Jizhong Energy Group And Tianshan Aluminum Group Sign A Long-term Strategic Partnership Agreement

Following the first successful import of bauxite from the Republic of Guinea,Jizhong Energy International Logistics Group Co.,Ltd.and Tianshan Aluminum Co.,Ltd.affiliated to the Eight Division of Xinjiang Production and Construction Corps("Tianshan Aluminum Group")have deepened their cooperation to sign a long-term strategic partnership agreement regarding materials supply,in order to guarantee the long-term supply security of bauxite.

Jizhong Energy Group Mulls Salt Chemical Base

The Hebei provincial government recentlyapproved Jizhong Energy Group Co.,Ltd.to develop the salt mine reserve inNingjin county,Xingtai,Hebei provinceto build an important salt chemical basein China.It was predicted that the recentlyproved salt mine has a salt reserve of morethan 100 billion tons,with an

冀中坳陷地区地下热水氟分布特征及其风险评估和开发利用建议

【研究目的】冀中坳陷地区地热资源丰富,地下热水中氟分布特征及其风险评估对地热资源开发利用具有重要意义。【研究手段】本文以冀中坳陷地区地下热水为研究对象,通过分析砂岩热储层和碳酸盐岩热储层地热流体水化学数据,研究地热流体中氟的分布特征和富集规律,评价地热流体质量,提出地热流体开发利用相关建议。【研究结果】研究区地热流体以Na-Cl和Na-Cl-HCO_(3)型水为主,基本为碱性水,优势阳离子为钠离子,氟含量较高,尤其碳酸盐岩热储地热流体氟离子含量集中分布在7.5~9.5 mg/L,最高达13.9 mg/L;弱碱性环境、水温和水岩作用是影响研究区氟离子富集的主要因素,砂岩热储中氟离子浓度与Ca^(2+)、Mg^(2+)浓度呈显著负相关,而碳酸盐岩热储中其相关性并不显著。氟的富集受到萤石等含氟矿物的控制,砂岩热储地热流体萤石饱和指数全部小于零,而氟离子浓度较高的碳酸盐岩储层地热流体萤石饱和指数普遍分布在零附近。【结论】研究区高氟地热流体不能直接用于生活饮用水、农田灌溉和渔业用水,在进行地热资源综合梯级利用时解决地热尾水除氟问题至关重要。

冀中坳陷杨税务地区奥陶系岩相古地理特征及其对潜山内幕储集层的控制作用

近年来,冀中坳陷杨税务地区潜山内幕油气勘探取得了显著成绩,而潜山内幕储集层形成受控因素多、成因较复杂,表现出较强的储集层非均质性。岩相古地理为潜山内幕储集层发育分布的重要影响因素之一,对指导潜山油气藏的勘探具有重要意义,其研究就成为解决问题的关键。根据岩心和薄片观察、结合钻测井及油气生产数据,通过单因素综合分析,认为奥陶系为潮坪沉积,划分为潮下带、潮间带、潮上带3个沉积亚相及8个沉积微相类型,在垂向上沉积微相由于海平面升降变化频繁,空间亦相变快,以潮间—潮下带沉积微相为主。平面上优势沉积微相以潮下带灰坪、潮间带云灰坪、灰云坪及灰坪为主;不同沉积微相环境下的储集层孔隙度差异较大,结合油气生产,认为潮间—潮上带的云坪、灰云坪和云灰坪微相控制了有利储集层的分布。

坳陷湖盆古湖泊多期次扩张—消亡演化模式

陆相湖盆沉积微相研究主要着眼于复合砂体的平面展布规律和垂向叠置关系,很少与多期次、多种湖退机制的低频湖泊演化模式建立联系。以饶阳凹陷肃宁—大王庄地区下渐新统为例,在岩心观察的基础上,结合测录井和三维地震资料,利用岩石学和地震沉积学两种证据分析古湖泊的演化过程和期次,建立多期次古湖泊扩张—消亡演化模式。研究表明:湖盆稳定坳陷背景下,早渐新世时期饶阳凹陷古湖泊经历了一次完整的扩张至消亡的低频演化过程,可以划分为快速主动扩张期、缓慢被动收缩期、快速被动收缩期、缓慢主动收缩期和缓慢被动消亡期。湖泊的主动扩张将早期形成的分流河道和河口坝改造为滩坝,正常湖退背景下湖泊的充填造就广阔的三角洲前缘河—坝复合砂体和三角洲平原网状分流河道体系,而强制湖退背景下湖泊的收缩则形成树枝状分流河道体系。湖泊的持续消亡可造成相同类型的复合砂体较上一期向湖迁移,垂向上则形成不同类型复合砂体的叠置。

冀中坳陷区域JZ04地热勘探井施工技术

JZ04井是中国地质调查局在华北地区冀中坳陷区域部署的一口地热勘探井,设计井深4000 m,完钻井深4016.63 m,完钻井径215.9 mm。针对一、二开井眼直径大容易产生井内坍塌、漏失、埋钻卡钻等事故,开展了钻具组合和钻井液配比研究;针对目的层取心效率低开展了取心技术研究。JZ04井的施工经验可为后续施工提供经验指导。另外,对实物岩心资料、测井资料、抽水试验数据等分析,获取该区域深部热储层厚度、温度、岩性、渗透性、出水量等参数,为揭穿高阳低凸起中南部新生界和中—新元古界碳酸盐岩地层,研究高阳低凸起中南部碳酸盐岩储层分布特征和深部地热资源评价工作提供基础资料。

岩石热导率校正对大地热流计算值的影响——以渤海湾盆地冀中坳陷为例

岩石热导率是计算大地热流的基础热物性参数,热导率的选取和校正是正确评估热流的基础。当前在冀中坳陷乃至渤海湾盆地的大地热流计算中,多以受季节性气温变化和地下水活动等因素影响较小的古近系和新近系砂泥质岩层作为大地热流的计算层位,岩石热导率也多参考区域内已有定值,而忽略了热导率对水饱和度、温度和压力的依赖性。笔者等从岩石热导率的温压校正和饱水校正角度出发,计算并比较了不同校正方法对热流值的影响。主要认识如下:(1)岩石热导率作为1个受多因素综合影响的热物性参数,其大小与岩性和矿物组分密切相关,同时通常与孔隙率呈负相关,而与密度呈正相关;(2)热导率高温实验结果显示,冀中坳陷砂岩样品热导率总体上随温度的升高而降低,在30~130℃的温度区间热导率降低了6.8%~11.3%,热导率下降率具有随热导率的降低而减小的趋势;由于砂岩和泥岩具有相对较浅的埋深和较低的原位温压条件,温压对热导率的正负效应可以在一定程度上相互抵消,对于热导率小于2 W/(m·K)的样品,温压对其的影响较小。(3)饱水校正后的冀中坳陷JZ03井和JZ04井古近系—新近系砂泥岩热导率的平均偏差分别高达43.0%、47.5%;(4)JZ03井和JZ04井古近系—新近系岩层热导率在未经任何校正、经含水率校正及经孔隙率校正情况下的大地热流值分别为43.05 mW/m^(2)、45.39 mW/m^(2)、61.64 mW/m^(2)和52.81 mW/m^(2)、59.81 mW/m^(2)、78.14 mW/m^(2);最终选取经几何平均模型饱水校正后的热导率计算得到的61.64 mW/m^(2)和78.14 mW/m^(2)两个热流值分别作为冀中坳陷牛北斜坡和高阳低凸起中部的大地热流值。

冀中坳陷HS1钻孔沉积物粒度及其沉积环境

对冀中坳陷HS1钻孔沉积物进行粒度分析,综合岩性、年代、生物标志等,探讨了3.5 Ma BP以来以冀中坳陷为代表的华北平原坳陷区的岩相古地理演化过程。结果表明,在新构造运动长期震荡式下降和气候不断变化的条件下,经流水作用改造依次经历了河流相与不稳定浅湖洼地相交替(上新世晚期)、河流相(早更新世)、河流相-片流相-短时洪泛相(中更新世)、河流相和泛滥平原相交替(晚更新世)、泛滥平原相(全新世)5个沉积演化阶段,且沉积物所处环境的水动力条件不断减弱,细颗粒组分不断增加。沉积物粒度颗粒组分含量与碳、氧同位素和孢粉所记录的气候变化具有同趋性,在寒冷干旱气候条件下细颗粒组分含量增加,而在温暖湿润的气候条件下粗颗粒组分含量增加;介于二者之间的气候条件下,沉积物的粒径变化较平缓,粒径区间范围较宽。粒度曲线反映的沉积环境的旋回性变化与孢粉、碳、氧同位素记录所划分的气候冷暖演化阶段耦合性较好,也与华北地区其他钻孔同时期相关记录较一致,这对重建区域古地理环境具有重要意义。