鄂尔多斯盆地富县地区马五段白云岩储层特征与演化

发布时间：2018-06-23 23:49

本文选题：膏质结核溶模孔 + 风化壳储层　；参考：《岩性油气藏》2016年03期

【摘要】：鄂尔多斯盆地奥陶系马家沟组马五段发育一套风化壳储层。通过岩心、岩石薄片、阴极发光、电子探针、碳与氧同位素和物性测试等实验分析并与中部气田区同类储层对比,研究了富县地区风化壳储层特征和形成演化规律,发现膏质结核溶模孔是本区最主要的储集空间,溶孔充填物多样且充填程度差异较大。研究认为:沉积相直接影响孔隙度大小(结核溶孔大小与数量),并间接影响储层渗透性(孔间释压裂缝的发育程度);表生期成岩作用决定储层的储集性能,大气淡水的选择性溶蚀构建溶孔轮廓,古地貌低部位孔隙被方解石完全充填;埋藏期成岩改造作用有限。明确了有利储层分布于马五段沉积期含膏云坪相和岩溶古地貌高部位叠置区域。沉积相和古地貌的精细描述是下一步有利储层预测的关键。
[Abstract]:A set of weathered crust reservoir is developed in Majiagou formation of Ordovician, Ordos Basin. The characteristics and evolution of weathered crust reservoirs in Fuxian area are studied through the experimental analysis of core, thin sheet, cathode luminescence, electron probe, carbon and oxygen isotopes and physical properties test and comparison with the similar reservoirs in the central gas field area. It was found that the dissolution pore of gypsum nodule was the most important reservoir space in this area, and the content of dissolved pore filling was various and the filling degree was different. It is considered that sedimentary facies directly affect porosity (size and number of nodule dissolved pores), and indirectly affect reservoir permeability (development degree of interpore pressure release fractures), and that diagenesis of supergene stage determines reservoir performance. The selective dissolution of fresh water in the atmosphere forms the outline of the dissolution pore, and the pores in the lower part of paleogeomorphology are completely filled with calcite, and the diagenetic transformation in the burial period is limited. It is clear that favorable reservoir is distributed in the area of gypsum bearing Yunping facies and high karst paleogeomorphology in the deposition period of the fifth member of Ma. Fine description of sedimentary facies and paleogeomorphology is the key to favorable reservoir prediction.
【作者单位】：中国石化江苏油田分公司勘探开发研究院;中国石油大学(北京)地球科学学院;中国石化石油勘探开发研究院;
【基金】：国家重点基础研究发展计划(973)项目“中国早古生代海相碳酸盐岩层系大型油气田形成机理与分布规律”(编号:2012CB214802) 国家重大科技专项“海相碳酸盐岩层系优质储层分布与保存条件评价”(编号:2011ZX05005-002)及“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)联合资助
【分类号】：P618.13

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