RELATIONSHIP BETWEEN DIAGENESIS AND RESERVOIR PROPERTIES IN JURASSIC DAANZHAI MEMBER, NORTHERN SICHUAN
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摘要: 作者采用地质综合和实验手段,把大安寨段划分为两期成岩作用阶段和七种成岩作用,确定大安寨段属于孔隙-裂隙型储集层,为油气勘探提供参考性建议.Abstract: Based on the examinations of rock sections, scanning electronic microscope and casting sections,and porosity and permeability of rocks,the author studied the diagenesis and reservoir properties in details. Diagenesis involves processes as follows. 1.transformation 2.replacement 3.compaction and pressolution 4.biological activity 5.cementation, 6.solution, 7.recry-stallization, as a combination of which diagenetical fractures and structural fractures developed. Notice should be paid to semi-filled-unfilled shells and horizontal fractures between cements. Interstitial pores, inter-stitial pores and solution pores within shells, and solution pores formed in late diagenesis stage, and microfractures resulted from pressolution which were eventually collaborated with diagenesis fractures, diagenetic solution fractures, structural fractures could improve reservoir properties. It is thought Daanzhai Menber is composed of reservoir of pore-fracture type, and suggestions for oil and gas exploration are provided.
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[1] 刘宝裙,1979年,沉积岩石学,地质出版社. [2] 郭一华等,1981年,碳酸盐岩成岩环境的特征(矿物岩石),第一卷,第六期. [3] 强子同等,1979年,大安寨石灰岩(大三段)成岩作用,南充石油学院院报. [4] W.V.恩格尔哈特著,王东坡等译,1982年,沉积物和沉积物的成因(沉积岩石学Ⅱ)地质出版社.
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