渤中凹陷西北缘东三段低渗透储层特征及控制因素

doi:10.3969/j.issn.1673-8926.2017.05.009

岩性油气藏 ›› 2017, Vol. 29 ›› Issue (5): 76–88.doi: 10.3969/j.issn.1673-8926.2017.05.009

渤中凹陷西北缘东三段低渗透储层特征及控制因素

庞小军, 代黎明, 王清斌, 刘士磊, 冯冲

中海石油(中国)有限公司天津分公司渤海石油研究院, 天津 300459

收稿日期:2016-10-31 修回日期:2016-12-18 出版日期:2017-09-21 发布日期:2017-09-21
第一作者:庞小军(1985-),男,硕士,工程师,主要从事石油地质方面的研究工作。地址:(300459)天津市滨海新区塘沽海川路2121号渤海石油研究院。Email:pangxiaojun@126.com。
基金资助:
“十三五”国家重大科技专项课题“渤海海域勘探新领域及关键技术研究”（编号：2016ZX05024003）资助

Characteristics and controlling factors of low permeability reservoirs of the third member of Dongying Formation in northwestern margin of Bozhong Sag

PANG Xiaojun, DAI Liming, WANG Qingbin, LIU Shilei, FENG Chong

Bohai Oilfield Research Institute, Tianjin Branch of CNOOC Ltd., Tianjin 300459, China

Received:2016-10-31 Revised:2016-12-18 Online:2017-09-21 Published:2017-09-21

摘要/Abstract

摘要： 渤中凹陷西北缘东三段发育典型的扇三角洲砂砾岩储层，但对储层的成岩演化及控制因素认识不清。利用岩心、壁心、铸体薄片、扫描电镜、物性等资料，结合埋藏史及油气充注史，对东三段砂砾岩扇三角洲储层的成岩演化及其对储层物性的影响进行了研究。结果表明：研究区东三段储层类型宏观上以杂基支撑砾岩、颗粒支撑砾岩、含砾砂岩、中—粗砂岩为主，细砂岩次之；微观上以长石岩屑砂岩和岩屑长石砂岩为主，岩屑以火山岩岩屑为主，变质岩岩屑次之。该区储层具有典型的低渗透特征，储集空间以溶蚀粒间孔为主，原生粒间孔次之。储层的成岩环境经历了中性→酸性（大气淡水淋滤）→碱性→酸性→碱性→酸性→碱性的变化。大气淡水淋滤后持续的压实作用和碱性条件下的碳酸盐、黏土矿物等的胶结作用均是形成低渗的根本原因，而大气淡水的淋滤作用和酸性环境下的溶蚀作用均是形成次生孔隙的主要原因，距今7Ma以来油气的持续充注作用有利于储层孔隙的保存，距今1.5Ma以来有机酸脱羧作用形成的碱性流体环境易形成碳酸盐胶结和伊利石充填，是形成低渗透储层的最终原因。

关键词: 定量化编图, 细粒沉积, 长7油层组, 鄂尔多斯盆地

Abstract: The third member of Dongying Formation(E₃d₃) developed typical fan delta glutenite reservoirs in the northwestern margin of Bozhong Sag,however,the understanding of diagenetic evolution and controlling factors of the reservoirs are unclear. Based on the data of cores,wall cores,cast thin slice,scanning electron microscope, physical properties,combined with the burial history and hydrocarbon filling history,the diagenetic evolution and its influence on physical properties of fan delta glutenite reservoirs of E₃d₃ were studied. The results show that the reservoirs are macroscopically dominated by heterogeneously supported conglomerates,granular supporting conglomerates,conglomerate sandstones,medium-coarse sandstones,followed by fine sandstones; and are microscopically dominated by feldspar lithic sandstone and lithic feldspathic sandstone,with the lithic being mainly of volcanic rocks,followed by metamorphic rocks. The reservoirs have low permeability,and the reservoir space is composed of intergranular dissolved pores,followed by primary intergranular pores. The diagenetic environment underwent a change from neutral to acidic(meteoric water leaching),alkaline,acidic,alkaline,acidic to alkaline. Continuous compaction after meteoric water leaching and the cementation of carbonate and clay minerals under alkaline conditions are the fundamental reasons for the low permeability,whereas the meteoric water leaching and dissolution in acidic environments are the main reason for the formation of secondary pores,and the continuous hydrocarbon filling is conductive to the preservation of reservoir pores since 7 Ma. The alkaline fluid environment formed by organic acid decarboxylation since 1.5 Ma is easy to form carbonate cementation and illite filling,which is the ultimate cause for the formation of low permeability reservoirs.

Key words: quantitative mapping, fine-grained sediment, Chang 7 reservoir, Ordos Basin

中图分类号:

TE122.2

庞小军, 代黎明, 王清斌, 刘士磊, 冯冲. 渤中凹陷西北缘东三段低渗透储层特征及控制因素[J]. 岩性油气藏, 2017, 29(5): 76–88.

PANG Xiaojun, DAI Liming, WANG Qingbin, LIU Shilei, FENG Chong. Characteristics and controlling factors of low permeability reservoirs of the third member of Dongying Formation in northwestern margin of Bozhong Sag[J]. Lithologic Reservoirs, 2017, 29(5): 76–88.

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渤中凹陷西北缘东三段低渗透储层特征及控制因素

Characteristics and controlling factors of low permeability reservoirs of the third member of Dongying Formation in northwestern margin of Bozhong Sag

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