STUDY ON DIAGENESIS OF THE MIDDLE AND UPPER JURASSIC RESERVOIR IN TURPAN DEPRESSION
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摘要: 笔者根据铸体薄片、扫描电镜、X-衍射和物性资料,研究了吐鲁番拗陷中上侏罗统储集层主要的成岩作用特征,认为压实作用和胶结作用是导致储集层孔隙结构变差的主要因素,溶解作用是改善储集层孔隙结构的主要因素。中侏罗统三间房-西山密组碎屑岩在溶解作用改造下具有较高的孔隙度和渗透度,成为吐鲁番拗陷重要的油气储集层。Abstract: The main diagenesis of the middle and upper Jurassic reservoirs in Turpan Depression is studied by means of the casting thin sections, scanning electron microscope, X-ray diffraction and physical properties. Compaction and cementation are the major factors turning the pore texture of reservoir worse; while dissolution is the major factor making the pore texture of reservoir better. Dissolution transformed the physical properties of reservoirs. Modified by dissolution, the clastic rock of Sanjianfang-Xishanyao Formation in the middle Jurassic became the most important reservoir of oil and gas with its high porosity and permeability in Turpan Depression.
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[1] 西北大学地质系编译.碎屑岩的成岩作用.西安:西北大学出版社,1986 [2] 邸世祥等.中国碎屑岩储集层的孔隙结构.西安:西北大学出版社,1991 [3] 刘林玉.济源凹陷中新生界砂岩物性特征.西北大学学报(自然科学版).1995.25(6):67-75 [4] 史基安等.长石砂岩中长石溶解作用发育机理及其影响因素分析.沉积学报,1994,(3):67-75
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