摘要
鄂尔多斯盆地姜家川地区长8油藏属于近源富集成藏,是特低孔、超低渗的典型致密油藏,分析储层成岩相类型并寻找受成岩相控制的优质储集体,可为有利储层预测和致密油藏高效开发提供依据。利用铸体薄片、扫描电镜、X射线衍射、阴极发光等手段,对目的层岩石学特征、成岩作用类型和成岩期次进行了研究,结合油田生产动态资料,分析了不同成岩相的特征、差异及其对产能的影响,预测了有利成岩相带分布。结果表明:长8储层主要为岩屑长石砂岩,压实作用和胶结作用使砂岩的原生孔隙结构遭到严重破坏,铁方解石、铁白云石等含铁碳酸盐的胶结作用是导致储层致密的决定性因素,成岩阶段中的溶蚀作用有利于改善储层的孔渗性能;主要成岩阶段处于中成岩阶段A期的晚期,同时部分区域进入中成岩阶段B期的早期,主要发育绿泥石膜胶结形成的残余粒间孔+长石溶孔相、绿泥石膜和伊利石胶结形成的残余粒间孔+长石溶孔相、伊利石胶结形成的长石溶孔相、碳酸盐胶结相等4类成岩相,其中绿泥石膜胶结形成的残余粒间孔+长石溶孔相物性最好、产油量最高,该成岩相分布区储集层具有良好的储渗能力。研究结果可为该区有利勘探区预测提供参考。
Chang 8 reservoir in Jiangjiachuan area in southeast Ordos Basin belongs to near-source hydrocarbon accumulation without long-distance hydrocarbon migration.It is a typical tight oil sandstone reservoir with extra low porosity and ultra-low permeability.It is helpful for reservoir exploration and development through analyzing reservoir diagenetic facies and looking for favorable belt controlled by diagenetic facies.The test and analysis data of casting thin slice,scanning electron microscope,XRD data and cathode luminescence were used to study petrology characteristics,diagenesis types and diagenetic period.Based on the data of oilfield production,the characteristics and differences of different diagenetic facies and their influences on productivity were analyzed,and the favorable diagenetic facies distribution was predicted.The results show that Chang 8 reservoir is mainly composed of lithic arkose sandstone.Compaction and cementation seriously destroyed the primary pore structure of sandstone.Cementation of iron calcite and ferric dolomite is the decisive factor for the tight of the reservoir,and the dissolution in the diagenetic stage is beneficial to the improvement of the porosity and permeability of the reservoir.Most of the reservoirs were under the middle diagenetic stage A,part reservoir is under the early diagenetic stage B.The diagenetic facies can be divided into four types,including intergranular pore and feldspar dissolution diagenetic phase formed by chlorite cementation,intergranular pore and feldspar dissolution diagenetic phase formed by chlorite and illite cementation,feldspar dissolution diagenetic phase formed by illite cementation,and carbonate cementation phase.The favorable belt with good physical properties and maximum oil production is considered as the intergranular pore and feldspar dissolution diagenetic phase formed by chlorite cementation.This research result can provide practical reference for favorable reservoir prediction and efficient development in the study area.
作者
徐波
王建
于乐丹
王凯泽
董凤娟
刘峰
XU Bo;WANG Jian;YU Ledan;WANG Kaize;DONG Fengjuan;LIU Feng(Xi’an Shiyou University,Xi’an 710065,China;Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil&Gas Reservoirs,Xi’an 710065,China;Research Institute of Exploration and Development,Shengli Oilfield Company,Sinopec,Dongying 257015,Shandong,China)
出处
《岩性油气藏》
CSCD
北大核心
2018年第6期109-116,共8页
Lithologic Reservoirs
基金
"十三五"国家重大科技专项"复杂断块油田提高采收率技术"(编号:2016ZX05011-002)
国家自然科学基金项目"基于多源信息和智能计算的钻井异常自适应预警方法研究"(编号:51574194)联合资助
