陕北斜坡南部上古生界石盒子组盒8段储层成岩作用研究  

Study on Reservoir Diagenesis of He8 Member of Upper Paleozoic Shihezi in the Southern Part of Northern Shaanxi Slope

作　　者：王凯 马强 杨航 赫文昊 王振国 Wang Kai;Ma Qiang;Yang Hang;He Wenhao;Wang Zhenguo(Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi'an,Shaanxi 710075,China;Baota Oil Production Plant of Yanchang Oilfield Co.,Ltd.,Yan'an,Shaanxi 716003,China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710075 [2]延长油田股份有限公司宝塔采油厂,陕西延安716003

出　　处：《非常规油气》2020年第4期33-39,共7页Unconventional Oil & Gas

基　　金：陕西省创新人才推进计划——重点科技创新团队计划“延长石油集团天然气勘探开发创新团队”(2015KCT-17)资助。

摘　　要：为了搞清陕北斜坡南部上古生界石盒子组盒8段储层的成岩作用类型及其对储层物性的影响,充分应用28口取芯井的109块普通薄片、22块铸体薄片的X射线衍射、阴极发光等资料,系统开展研究区储层岩石学、成岩作用类型及成岩演化等方面的研究工作。结果表明:盒8段砂岩成分主要以石英砂岩和岩屑石英砂岩为主;主要成岩作用类型为机械压实作用、压溶作用、胶结作用、交代作用;成岩阶段处于中成岩阶段B期,其成岩演化序列为早期压实作用—压溶作用—早期方解石胶结—绿泥石—石英次生加大—溶蚀作用—长石、岩屑泥质杂基高岭石化—铁方解石及铁白云石胶结作用—伊利石。压实作用使储层孔隙度平均降低了20.7%,胶结作用使孔隙度平均减少了7.5%,两者是盒8段储层变差的主要原因;而溶蚀作用产生的平均孔隙度为3.2%,一定程度上改善了储层物性。In order to clarify the diagenesis type and its effect on the reservoir physical properties of the He8 member of the Upper Paleozoic Shihezi in the southern part of northern Shaanxi slope, fully applied the data of 28 well cores, 109 common slices, 22 cast slices and X-ray diffraction, cathodoluminescence, etc. to systematically carry out research work on reservoir petrology, diagenesis type and diagenesis evolution in the study area. The results showed that the sandstone components of the He8 member are mainly quartz sandstone and detrital quartz sandstone. The main types of diagenesis are mechanical compaction, pressure solution, cementation, and metasomatism. The diagenesis stage is in the B stage of the mid-diagenesis stage, its diagenetic evolution sequence is: early compaction-pressure dissolution-early calcite cement-chlorite-quartz secondary increase-dissolution-kaolin petrification of feldspar and detrital muddy complex-iron calcite and iron dolomite cementation-illite. The compaction reduced the average porosity of the reservoir by 20.7%, cementing reduced porosity by 7.5% on average, both were the main reasons for the deterioration of the He8 member reservoir. Dissolution produced an average porosity of 3.2%, to a certain extent, the reservoir physical properties had been improved.

关 键 词：陕北斜坡南部 盒8段储层 成岩作用类型 成岩阶段 

分 类 号：TE122[石油与天然气工程—油气勘探]