储层致密化影响因素分析与有利成岩相带预测——以马岭油田长8油层组砂岩储层为例  被引量:21

Influencing factors of tight reservoirs and favorable diagenetic facies:a case study of Chang 8 reservoir of the Upper Triassic Yanchang Formation in Maling Oilfield,Ordos Basin

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作  者:王猛[1,2,3] 曾明[3] 陈鸿傲 杨刚 徐绩芳 邱海滨 郭红光 王家敏 WANG Meng ZENG Ming CHEN Hong'ao YANG Gang XU Jifang QIU Haibin GUO Hongguang WANG Jiamin(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500 China School of Geoscience and Technology, Southwest Petroleum University, 610500 Chengdu, China No. 2 Oil Production Plant, PetroChina Changqing Oilfield Company, Qingcheng 745100, Gansu, China Changqing Division of Logging Limited Company, CNPC, Xi, an 710021, China)

机构地区:[1]油气藏地质及开发工程国家重点实验室.西南石油大学,成都610500 [2]西南石油大学地球科学与技术学院,成都610500 [3]中国石油长庆油田分公司第二采油厂,甘肃庆城745100 [4]中国石油集团测井有限公司长庆事业部,西安710021

出  处:《岩性油气藏》2017年第1期59-70,共12页Lithologic Reservoirs

基  金:国家重大科技专项"中国大型气田形成条件;富集规律及目标评价"(编号:2011ZX05007-004)资助

摘  要:马岭油田延长组长8油层组属典型的低孔、低渗致密砂岩储层,分析成岩因素对储层致密化的影响,并预测有利成岩相带发育区对寻找有利储层勘探区具有指导意义。通过岩心、铸体薄片、高压压汞、扫描电镜、X射线衍射等分析,研究了长8油层组储层岩石学、孔隙结构、物性特征,探讨了不同成岩作用因素对储层物性的影响,进而建立了成岩相划分标准,预测了有利成岩相带展布。结果表明:长8油层组为低孔、低渗储层,孔喉结构微观非均质性强;砂岩经历了中—强压实、中—强胶结和弱溶蚀成岩改造,压实、硅质胶结及碳酸盐胶结等作用共同促使了储层致密化,伊利石的存在造成了渗透率降低,绿泥石环边胶结、烃类侵位、长石及岩屑的溶蚀作用对储层发育均具有建设性作用,高岭石指示了次生孔隙的形成,但会对渗透率造成破坏;划分出6种成岩相,其中绿泥石-自生石英胶结相与溶蚀相等有利成岩相纵向上发育于长81、长82小层上部与中部,平面上呈透镜状、条带状,与水下分流河道、河口坝砂体具有较好的匹配关系,长81小层有利成岩相发育区规模远大于长82小层。The Chang 8 reservoir of the Upper Triassic Yanchang Formation in Maling Oilfield is characterized by tight sandstone of typical low porosity and low permeability. To analyze the influences of diagenesis on reservoir densification and evaluate favorable diagenetic facies, based on the data of core observation, cast thin section, mercury injection test, scanning electron microscopy and X-ray diffraction test, the reservoir petrology, pore structure and physical properties of Chang 8 reservoir were studied, the influence of different diagenesis on reser- voir quality was discussed, a standard of diagenetic facies division was established, and the distribution of favor- able diagenetic facies area was evaluated. The Chang 8 sandstone is characterized by strong microscopic hetero- geneity and striped-shaped or lentoid, which have a good matching with subaqueous distributary channel and mouth bar sand bodies. The sandstone experienced medium to strong compaction, medium to strong cementation, and weak dissolution. The compaction, siliceous cementation and carbonate cementation led to reservoir densifi- cation synthetically. The presence of illite resulted in permeability reduce; chlorite coating, hydrocarbon emplace- ment, feldspar and debris dissolution contribute to reservoir development; kaolinite indicates the formation of sec- ondary porosity, while it would cause permeability damage. The sandstones were divided into six types of diage- netic facies, among these diagenetic facies, chlorite-authigenic quartz cementation facies and dissolution facies are favorable diagenetic facies, which developed in the upper and middle of large scale Chang 81 and small scale Chang 82 reservoir.

关 键 词:成岩作用 成岩相 长8油层组 马岭油田 鄂尔多斯盆地 

分 类 号:TE122.2[石油与天然气工程—油气勘探]

 

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