纸坊北-顺宁地区长6-长9致密油储层成岩-成藏耦合研究

发布时间：2018-02-11 14:38

本文关键词： 成岩作用孔隙度恢复成藏期次致密砂岩　出处：《西安石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：鄂尔多斯盆地延长组砂岩储层致密与成藏时间先后认识存在3种观点:(1)先成藏后致密;(2)先致密后成藏;(3)边致密边成藏。本文通过铸体薄片、常规薄片、场发射扫描电镜、流体包裹体测温、包裹体激光拉曼分析,包裹体荧光光谱分析等分析化验手段,对研究区长6-长9油层组致密砂岩成岩作用类型、成岩演化及成藏史进行分析,在此基础上定量计算压实作用、胶结作用和溶蚀作用对储层孔隙演化的影响,恢复了储层致密化的历史过程,进而确定研究区长6-长9油层组致密砂岩致密-成藏的先后关系。研究表明:(1)研究区长6-长9油层组致密砂岩发生压实作用、胶结作用和溶蚀作用等成岩作用,演化到中成岩A。成岩序列为:压实作用-绿泥石膜-泥晶方解石-硅质-亮晶方解石-伊利石-颗粒溶蚀-油气充注。(2)储层原始孔隙度约35.4%;压实减孔率介于49.80%-61.64%,压实剩余孔隙度介于13.52%-17.85%,压实后储层尚未致密。胶结减孔率介于26.87%-31.65%,说明强烈的压实作用是储层致密的主因,胶结作用使储层进入致密状态;溶蚀增孔率介于6.86%-10.78%,溶蚀作用改善了储层物性,但未能改变储层致密的性质。(3)研究区长6-长9油层组致密砂岩油藏充注是一个漫长且连续的过程,主成藏期为130~110Ma(早白垩世末)。(4)中侏罗世-晚侏罗世,长9、长8、长7、长6储层先后达到致密(φ=12%);早白垩世大量油气充注成藏,此时孔隙度降至12%以下,反映主要成藏期各套储层均已经致密,为先致密后成藏。
[Abstract]:The formation of sandstone reservoir in Yanchang formation, Ordos Basin, has been recognized in terms of three viewpoints: 1: 1) first, then 2) first, then 3)) the formation of sandstone reservoir at the same time (3) through casting thin slice, conventional thin section, field emission scanning electron microscope, this paper discusses the formation of sandstone reservoir in Yanchang formation, Ordos Basin. By means of temperature measurement of fluid inclusions, laser Raman analysis of inclusions and fluorescence spectrum analysis of inclusions, the diagenesis types, diagenetic evolution and accumulation history of tight sandstone in Chang6Chang9 oil formation in the study area were analyzed. On this basis, the influence of compaction, cementation and dissolution on pore evolution of reservoir is calculated quantitatively, and the historical process of reservoir densification is restored. The relationship between dense sandstone densification and reservoir formation in Chang6Chang9 reservoir formation is determined. The results show that the compaction, cementation and dissolution of tight sandstone in Chang6Chang9 reservoir formation in the study area occur, such as diagenesis, cementation and dissolution, etc. The diagenetic sequence is as follows: compaction-chlorite film-mudstone calcite-siliceous calcite-Illite-Illite-dissolution-oil and gas filling. The residual porosity is between 13.52 and 17.85, and the reservoir is not compact after compaction. The cementation porosity is between 26.87 and 31.65, which indicates that the strong compaction is the main cause of tight reservoir. Cementation causes the reservoir to enter a dense state, the dissolution increases porosity between 6.86 and 10.78, and the dissolution improves the physical properties of the reservoir, but fails to change the tight nature of the reservoir.) it is a long and continuous process for the tight sandstone reservoir of Chang 6- Chang 9 reservoir in the study area to be filled. The main reservoir forming period was 130U 110Ma (late early Cretaceous), middle Jurassic-Late Jurassic, Chang 9, Chang 8, Chang 7, Chang 6 reservoirs reached density successively (蠁 ~ (12)), and early Cretaceous a large amount of oil and gas was filled and formed, and the porosity decreased to below 12%. It reflects that all sets of reservoirs in the main reservoir forming period are already dense, which is the first dense reservoir and then the later reservoir formation.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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