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Dolomitization evolution and its effects on hydrocarbon reservoir formation from penecontemporaneous to deep burial environment

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Petroleum Exploration and Development 2022年第4期49卷 731-743页

作者： SHEN Anjiang LUO Xianying HU Anping qiao zhanfeng ZHANG Jie PetroChina Hangzhou Institute of Petroleum Geology Hangzhou 310023China Key Laboratory of Carbonate Reservoirs CNPCHangzhou 310023China

Aiming at the scientific problem that only part of dolomite acts as dolomite reservoir,this paper takes the multiple dolomite-bearing formations in the Tarim and Ordos basins,NW China and Sichuan Basin,SW China as the study object,by means of mineral petrological analysis and geochemical methods including carbonate clumped isotope,U-Pb isotopic dating,etc.,to rebuild the dolomitization pathway and evaluate its effects on reservoir formation.On the basis of detailed rock thin section observation,five dolomitic structural components are identified,including original fabric-retained dolomite(microbial and/or micrite structure),buried metasomatic dolomite I(subhedral-euhedral fine,medium and coarse crystalline structure),buried metasomatic dolomite II(allotriomorphic-subhedral fine,medium and coarse crystalline structure),buried precipitation dolomite and coarse crystalline saddle dolomite.Among them,the first three exist in the form of rocks,the latter two occur as dolomite minerals filling in pores and fractures.The corresponding petrological and geochemical identification templates for them are established.Based on the identification of the five dolomitic structural components,six dolomitization pathways for three types of reservoirs(preserved dolomite,reworked dolomite and limestone buried dolomitization)are distinguished.The initial porosity of the original rock before dolomitization and the dolomitization pathway are the main factors controlling the development of dolomite reservoirs.The preserved dolomite and reworked dolomite types have the most favorable dolomitization pathway for reservoir formation,and are large scale and controlled by sedimentary facies in development and distribution,making them the first choices for oil and gas exploration in deep carbonate formations.

关键词： dolomitization dolomitization pathway dolomite reservoir carbonates penecontemporaneous environment burial environment dolomite genesis identification template

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Sedimentary and reservoir architectures of MB1-2 sub-member of Middle Cretaceous Mishrif Formation of Halfaya Oilfield in Iraq

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Petroleum Exploration and Development 2020年第4期47卷 762-772页

作者： SUN Wenju qiao zhanfeng SHAO Guanming SUN Xiaowei GAO Jixian CAO Peng ZHANG Jie CHEN Wangang PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China China United Coalbed Methane Corp. Ltd.Beijing 100011China PetroChina Hangzhou Research Institute of Geology Hangzhou 310023China CNPC Key Laboratory of Carbonate Reservoir Hangzhou 310023China

Based on comprehensive analysis of core,cast thin section,logging and seismic data,the sedimentary and reservoir architectures of the MB 1-2 sub-member of Mishrif Formation in Halfaya Oilfield,Iraq,are studied.The MB 1-2 sub-member of Mishrif Formation has three types of microfacies,lagoon,bioclastic shoal,and tidal channel,and facies architecture controlled by sequence stratigraphy.In the 4th-order sequence,the lagoon facies aggradated vertically,and the bioclastic shoals in lenticular shape embed in the background of lagoon,the end of the sequence is incised by the"meandering river"shape tide channel,which represents the depositional discontinuity.Three types of reservoirs including tidal channel grainstone to packstone reservoirs,bioclastic shoal grainstone to packstone reservoirs and dissolved lagoon wackestone reservoirs are developed.The reservoir architectures within tidal channel and bioclastic shoal are strickly controlled by grainy facies,whereas the dissolved lagoon reservoirs controlled by both facies and dissolution are related to the sequence boundary.The reservoir sections occur mainly in the 4 th sequence highstand systems tract(HST)and are separated by barriers formed in the transgressive systems tract(TST).Complicated facies architecture and dissolution modification resulted in strong heterogeneity within the reservoir,which showed the characteristics of"attic type"architecture.The results of this study can guide the development of similar reservoirs in the Middle East.

关键词： Iraq Halfaya Oilfield Cretaceous Mishrif Formation sedimentary microfacies reservoir architecture

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Eogenetic karst and its control on reservoirs in the Ordovician Majiagou Formation, eastern Sulige gas field, Ordos Basin, NW China

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Petroleum Exploration and Development 2020年第6期47卷 1246-1261页

作者： XIE Kang TAN Xiucheng FENG Min WANG Baobao ZHONG Shoukang YANG Mengying NIE Wancai qiao zhanfeng ZENG Wei State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China Department of Key Laboratory of Carbonate Reservoir of CNPC Southwest Petroleum UniversityChengdu 610500China Exploration and Development Research Institute of PetroChina Changqing Oilfield Company Xi’an 710018China Yihuang Natural Gas Department of PetroChina Changqing Oilfield Company Xi’an 710018China PetroChina Hangzhou Research Institute of Geology Hangzhou 310023China

To further ascertain the origin of the Ordovician Majiagou Formation reservoirs in the Ordos Basin,the M54-M51 sub-members of the Ordovician Majiagou Formation in the eastern Sulige gasfield of Ordos Basin were taken as examples to analyze the vertical development characteristics of eogenetic karst and to discover the dissolution mechanism and its control on reservoirs through observation of a large number of cores and thin sections.According to detailed analysis of petrologic characteristics,the reservoir rock types include micritic dolomite,grain dolomite and microbialite which have mainly moldic pore,intergranular(dissolved)pore,and(dissolved)residual framework pore as main reservoir space respectively.The study area developed upward-shallowing sequences,with an exposure surface at the top of a single upward-shallowing sequence.The karst systems under the exposure surface had typical exposure characteristics of early dissolution and filling,indicating these reservoirs were related to the facies-controlled eogenetic karstification.With the increase of karstification intensity,the reservoirs became worse in physical properties.

关键词： porous reservoir reservoir characteristics eogenetic karst dolomite Majiagou Formation Ordovician Sulige gas field Ordos Basin

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Sedimentary environment and petrological features of organic-rich fine sediments in shallow water overlapping deposits: A case study of Cambrian Yuertus Formation in northwestern Tarim Basin, NW China

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Petroleum Exploration and Development 2020年第3期47卷 513-526页

作者： JIN Zhimin TAN Xiucheng TANG Hao SHEN Anjiang qiao zhanfeng ZHENG Jianfeng LI Fei ZHANG Shixuan CHEN Lei ZHOU Chenggang State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China Key Laboratory of Carbonate Reservoir CNPCHangzhou 310023China Korla Branch of Geophysical Research Institute BGP Inc.Korla 841000China

Taking the Cambrian Yuertus Formation outcrop profiles in the Aksu-Keping-Wushi areas of northwestern Tarim Basin as examples, the depositional environments of organic rich fine sediment were analyzed by examining the outcrop profiles macroscopically and microscopically. The study reveals that:(1) The lower part of the Yuertus Formation consists of organic-rich fine sediment or thin rhythmic interbeds of organic-rich fine sediment and siliceous sediment, the formation transforms to terrigenous diamictic grain shoal and inverse grading carbonate rocks upward.(2) The thin limestone interbedded with dark shale rhythmically has inverse grading.(3) The thin-bedded siliceous rock has metasomatic residual granular texture, stromatolithic structure and cementation fabric in vugs.(4) There are iron crust layers at the top of the shallowing diamictic grain shoal, beneath which exposed karst signs, such as karrens, dissolved fissures, sack-like vugs, near surface karst(plastic) breccia, breccia inside the karst system and terrigenous clastic fillings, can be seen.(5) Both the outcrops and seismic profiles show that organic-rich fine sediments above the unconformities or exposed surfaces are characterized by overlapping. The organic-rich fine sediment of the Cambrian Yuertus Formation was deposited in the anoxic-suboxidized restricted gulf lagoon environment, and its formation was controlled by high paleoproductivity and poor oxygen exchange jointly, then a shallow-water overlapping sedimentary model has been established. The results will help enrich and improve the sedimentary theory of organic-rich fine sediments.

关键词： fine-grained sediments source rock shallow water overlap exposed surface paleokarst sedimentary model Cambrian Yuertus Formation Tarim Basin

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Digitized Outcrop Geomodeling of Ramp Shoals and its Reservoirs： as an Example of Lower Triassic Feixianguan Formation of Eastern Sichuan Basin

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Acta Geologica Sinica(English Edition) 2017年第4期91卷 1395-1412页

作者： qiao zhanfeng SHEN Anjiang ZHENG Jianfeng Xavier JANSON CHANG Shaoying WANG Xiaofang CHEN Yana LIAO Yisha Petrochina Hangzhou Research Institute of Geology Hangzhou 310023 Zhejiang China CNPC Key Laboratory of Carbonate Reservoir Hangzhou 310023 Zhejiang China Bureau of Economic Geology Jackson School of Geosciences The University of Texas at Austin Austin Tx 78731 USA Chongqing Gas District of SouthWest Oil and Gas Company of CNPC Chongqing 400021 China

Numerous hydrocarbon accumulations are found in ramp crest shoals worldwide and therefore this depositional setting has a high potential of being the hydrocarbon reservoir. In this paper, we combined digital outcrop geology and traditional geological mapping to build an outcrop-based geocellular model of the ramp-crest shoal complex of the Lower Triassic Feixianguan Formation in the Eastern Sichuan Basin. The outcrop model serves as an analogue for the subsurface reservoir of the Feixianguan Formation and illustrates the complexity of the lithofacies types, stratigraphic architecture, and reservoir heterogeneities at a scale below conventional subsurface data resolution. The studied ramp -crest shoal complex consists of thirteen types of lithofacies that can be grouped into three facies-groups corresponding to subtidal intraclastic shoal, sub- to inter-tidal oolitic shoal, and tidal flat depositional environments respectively. The stratigraphic architecture of the shoal complex shows mostly a strong progradation of the high energy facies associated with an overall decrease of accommodation space associated with relative sea level still stand. Two reservoir facies associations have been recognized. The first one consists of supratidai dolomudstone and upper intertidal partially dolomitized oolitic packstone with anhydrite or nodules. These facies were deposited above the high energy oolitic grainstones and occurs as thin-bedded and laterally continuous layers, characterized by high porosity and low permeability. The second reservoir facies association is composed of intertidal crystalline dolomite and subtidal intraclastic bindstone that occurs stratigraphically below the oolitic grainstones. These deposits consist of massive laterally discontinuously beds, and are characterized by high porosity and high permeability. Both types of reservoir facies tend to be stacked vertically and migrated laterally with the progradation of the shoal complex. The construction of the outcrop-based 3D geological model provide a des

关键词： Digitized outcrop geomodeling ramp shoal reservoir Feixianguan Formation Sichuan Basin

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参与式行动:中国乡村振兴实践的路径选择

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南京农业大学学报（社会科学版） 2023年第2期23卷 24-32,102页

作者：郭占锋张森乔鑫西北农林科技大学陕西省乡村治理与社会建设协同创新研究中心/人文社会发展学院杨凌712100 中国农业大学人文与发展学院北京100193

实现农村发展是中西方国家面临的共同议题。以近代西方国家发展干预的演变过程及特征作为线索,罗伯特·钱伯斯在《农村发展:以末为先》一书中深度反思农村发展实践项目失败的主要缘由,围绕实践干预过程中存在的问题,倡导“外来者”要进... 详细信息

实现农村发展是中西方国家面临的共同议题。以近代西方国家发展干预的演变过程及特征作为线索,罗伯特·钱伯斯在《农村发展:以末为先》一书中深度反思农村发展实践项目失败的主要缘由,围绕实践干预过程中存在的问题,倡导“外来者”要进行价值转换,遵循“以末为先”的发展理念,并认为参与式行动是该理念的实践方案。中西方国家在历史演变进程、制度环境、乡村社会基础等方面存在着根本差异,应结合中国城乡发展逻辑体系和乡村振兴战略的具体实践要求,探讨罗伯特·钱伯斯提出的参与式行动在中国乡村发展过程中的适用性与重要性。乡村振兴是“外来者”与当地民众之间双向互动、共同参与的过程,其自身所拥有的各类资源是推动乡村振兴的重要力量。因此,要立足于中国乡村发展的本土化特征,在充分发挥“外来者”与“内部人”各自优势的基础上进行协作。同时,在乡村振兴具体实践中还需明晰各个行动主体的能力和任务,实现“参与”与“行动”的兼顾,高效整合多元系统,从而推动乡村振兴高质量开展。

关键词：参与式行动以末为先农村发展乡村振兴

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塔里木盆地蓬莱坝组层状白云岩储层发育规律

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地球科学 2023年第2期48卷 673-689页

作者：乔占峰张天付贺训云熊冉中国石油杭州地质研究院浙江杭州310023 中国石油天然气集团公司碳酸盐岩储层重点实验室浙江杭州310023

塔里木盆地蓬莱坝组油气勘探潜力巨大,但勘探对象上存在“断溶体”和层状白云岩的争议.在露头与钻井储层特征认识的基础上,岩石学与碳氧锶同位素和激光U-Pb定年等地球化学分析相结合,探讨了蓬莱坝组白云岩的成因机制及层状规模储层发育... 详细信息

塔里木盆地蓬莱坝组油气勘探潜力巨大,但勘探对象上存在“断溶体”和层状白云岩的争议.在露头与钻井储层特征认识的基础上,岩石学与碳氧锶同位素和激光U-Pb定年等地球化学分析相结合,探讨了蓬莱坝组白云岩的成因机制及层状规模储层发育潜力与发育规律,进而根据白云岩储层分布预测讨论了塔里木盆地蓬莱坝组的勘探方向.取得3点认识:(1)蓬莱坝组发育孔隙-孔洞型白云岩储层,平均孔隙度2.81%,最高可达13.91%,具备发育优质储层的潜力;(2)白云岩储层以准同生白云岩叠加浅埋藏云化作用形成的埋藏白云岩为主,具有相控性和规模性,可层状发育,主要分布于内缓坡-中缓坡准同生云化滩;(3)塔北南缘和塔中北斜坡为层状规模优质白云岩储层发育有利区,是该领域值得探索的勘探方向.

关键词：白云岩埋藏白云石化规模储层蓬莱坝组塔里木盆地石油地质

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从准同生到埋藏环境的白云石化路径及其成储效应

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石油勘探与开发 2022年第4期49卷 637-647页

作者：沈安江罗宪婴胡安平乔占峰张杰中国石油杭州地质研究院杭州310023 中国石油天然气集团有限公司碳酸盐岩储层重点实验室杭州310023

以塔里木、四川和鄂尔多斯盆地多层系白云岩为研究对象,应用矿物岩石学分析、团簇同位素测温及U-Pb同位素测年等技术手段,开展白云石化路径及其成储效应研究。识别出保留原岩结构白云岩(微生物结构和泥晶结构)、埋藏交代白云岩Ⅰ(半自... 详细信息

以塔里木、四川和鄂尔多斯盆地多层系白云岩为研究对象,应用矿物岩石学分析、团簇同位素测温及U-Pb同位素测年等技术手段,开展白云石化路径及其成储效应研究。识别出保留原岩结构白云岩(微生物结构和泥晶结构)、埋藏交代白云岩Ⅰ(半自形—自形细、中、粗晶结构)、埋藏交代白云岩Ⅱ(他形—半自形细、中、粗晶结构)、埋藏沉淀白云石、粗晶鞍状白云石5种结构组分。前3者以岩石的形式存在,后两者以充填孔洞和裂缝的白云石矿物形式存在,并建立了5种白云岩结构矿物岩石学和地球化学特征识别图版。基于5种白云石结构组分的识别,建立了白云岩保持型、白云岩改造型和灰岩埋藏白云石化型等3类储集层的6种白云石化路径。白云石化前的原岩初始孔隙和白云石化路径是控制白云岩储集层发育的关键因素,白云岩保持型和白云岩改造型白云石化路径的成储效应最佳,且发育分布具有相控性和规模性特征,是深层碳酸盐岩油气勘探的首选对象。

关键词：白云石化作用白云石化路径白云岩储集层碳酸盐岩准同生环境埋藏环境白云岩成因识别图版

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深水碳酸盐岩沉积体系与储层发育控制因素--以中东H油田白垩系Khasib组为例

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海相油气地质 2022年第1期27卷 1-10页

作者：张杰乔占峰王友净王鼐吕洲中国石油杭州地质研究院中国石油集团碳酸盐岩储层重点实验室中国石油勘探开发研究院

深水碳酸盐岩是有利的油气储集岩,中东地区上白垩统Khasib组缓坡型深水碳酸盐岩是重要的产油层系。伊拉克H油田Khasib组储层非均质性较强,储层发育特征及控制因素、油气分布规律不清,制约了选区评价及勘探部署。在区域地质调研的基础上... 详细信息

深水碳酸盐岩是有利的油气储集岩,中东地区上白垩统Khasib组缓坡型深水碳酸盐岩是重要的产油层系。伊拉克H油田Khasib组储层非均质性较强,储层发育特征及控制因素、油气分布规律不清,制约了选区评价及勘探部署。在区域地质调研的基础上,基于岩心、薄片和测井资料,对H油田Khasib组岩相、沉积微相和沉积模式、储层发育控制因素进行了研究,取得了以下认识:①研究区发育生物碎屑颗粒灰岩、生物碎屑泥粒灰岩、含生物碎屑粒泥灰岩、泥晶灰岩和灰质泥岩5种岩石类型;②研究区中缓坡相海侵体系域发育3类碳酸盐岩沉积微相(生物碎屑滩、滩翼、缓坡灰泥)和1类碳酸盐岩重力流沉积;③Khasib组KA1-2小层和KB段储层的生物扰动较发育,渗透率与骨屑颗粒含量呈正相关,储层主要受沉积微相、生物扰动和准同生溶蚀作用控制。明确了研究区6个小层的沉积微相演化规律,建立了伊拉克地区从西到东的滨岸—内缓坡—中缓坡—外缓坡的缓坡型碳酸盐沉积模式,研究成果对于深水碳酸盐岩储层分布预测具有借鉴和参考意义。

关键词：深水碳酸盐岩中缓坡沉积微相沉积模式 Khasib组中东

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碳酸盐台地内下切谷的识别及其意义--以伊拉克H油田上白垩统Mishrif组为例

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海相油气地质 2022年第1期27卷 55-62页

作者：邵冠铭乔占峰曹鹏张杰孙晓伟中国石油杭州地质研究院中国石油集团碳酸盐岩储层重点实验室

碳酸盐台地下切谷的研究多基于阿曼上白垩统露头。以中东地区伊拉克H油田上白垩统Mishrif组钻井岩心、测井和三维地震数据为基础,结合区域层序地层,从沉积旋回、岩相特征、测井响应、地震相平面分布与垂向演化等方面,对碳酸盐台地发育... 详细信息

碳酸盐台地下切谷的研究多基于阿曼上白垩统露头。以中东地区伊拉克H油田上白垩统Mishrif组钻井岩心、测井和三维地震数据为基础,结合区域层序地层,从沉积旋回、岩相特征、测井响应、地震相平面分布与垂向演化等方面,对碳酸盐台地发育的下切谷这一重要沉积微相类型开展研究,并对其意义作了探讨。研究表明:①H油田MB2-1亚段发育碳酸盐台地内下切谷。下切谷内部以泥晶灰岩充填为主(与下伏颗粒灰岩明显不同),颗粒向上变细再变粗;测井曲线具有箱形特点;地震剖面上呈平行—近平行短轴强振幅反射,边界清晰,平面上显示近似河道形态但更平直。②下切谷在SQ_(3)高位域晚期(MB2-1亚段沉积末期)侵蚀成谷,SQ_(4)海侵期快速充填,下切谷的底部代表了区域层序界面。③下切谷切割MB2-1亚段,而且岩性整体致密,可成为油藏的横向隔挡层。碳酸盐台地下切谷的发现,对于层序边界识别、油藏非均质性研究具有重要意义。

关键词：碳酸盐台地下切谷隔挡层层序边界白垩系伊拉克

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