查干凹陷下白垩统巴二段储层特征及孔隙演化

发布时间：2018-04-23 03:14

本文选题：储层特征 + 成岩作用　；参考：《岩性油气藏》2017年01期

【摘要】：为了研究查干凹陷西部次凹巴二段碎屑岩储层特征,分析成岩作用对孔隙度的影响,根据岩心、薄片观察,以及X射线衍射、扫描电镜等储层分析测试资料,建立适合研究区的孔隙度演化定量模型,进而对孔隙演化史进行定量恢复。巴二段储层以长石岩屑砂岩为主,具有"两低一高"的特征,储层物性差,以特低—超低孔、特低—超低渗储层为主,孔隙度为0.17%~15.32%,平均为5.7%,渗透率为0.003 7~162.300 0 mD,平均为3.4 mD,储集空间类型主要为粒间溶蚀孔;巴二段储层经历了早期机械压实、早期碳酸盐胶结、碳酸盐溶蚀和晚期碳酸盐胶结等成岩作用,在埋深为2 100~2 800 m处发育次生孔隙带,现今巴二段大部分处于中成岩A2期。孔隙度演化定量模型计算结果表明:乌力吉构造带巴二段储层原始孔隙度为30.5%,压实作用减孔(使孔隙度减小)19.8%,胶结-交代作用减孔9.7%,溶蚀作用增孔(使孔隙度增加)3.7%,这在一定程度上改善了储层物性(现今孔隙度约为4.8%)。计算结果与实测孔隙度吻合,建立的模型对孔隙演化过程和优质储层预测具有指导作用。
[Abstract]:In order to study the characteristics of clastic rock reservoir in the subsag of the western Chagan sag and analyze the effect of diagenesis on porosity, according to the core, thin slice observation, X-ray diffraction, scanning electron microscope and other reservoir analysis and test data, A quantitative model of porosity evolution was established for the study area, and then the pore evolution history was quantitatively restored. The reservoir of the second member of Ba member is mainly composed of feldspar lithic sandstone with the characteristics of "two low and one high". The reservoir physical properties are poor, and the reservoirs are mainly ultra-low porosity and ultra-low permeability reservoirs. The porosity is 0.17 ~ 15.32, the average value is 5.7, the permeability is 0.003 ~ 162.300 mD, the average is 3.4mD. the reservoir space type is mainly intergranular corrosion pore, the reservoir in the second member of Ba ~ (2) formation experienced early mechanical compaction, early carbonate cementation, The diagenesis, such as carbonate dissolution and late carbonate cementation, developed secondary pore zones at a buried depth of 2 100 ~ 2 800 m, and most of the present Ba member is in the middle diagenetic A2 stage. The results of quantitative model of porosity evolution show that the original porosity of the reservoir in the second member of Ba member of Uliji structural belt is 30.5, the compaction reduces the porosity by 19.8%, the cement-metasomatism decreases the porosity by 9.7%, and the dissolution increases the porosity. The addition of 3. 7% can improve the reservoir physical properties to some extent (the present porosity is about 4. 8%). The calculated results are in agreement with the measured porosity, and the established model can guide the pore evolution process and the prediction of high quality reservoirs.
【作者单位】：中国石油大学(北京)地球科学学院;中国石油大学(北京)油气资源与探测国家重点实验室;中国石化中原油田分公司石油勘探开发研究院;
【基金】：国家油气重大专项项目“岩性地层油气藏沉积体系、储层形成机理与分布研究”(编号:2011zx05001-002)资助
【分类号】：P618.13

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