高青地区上石盒子组石英砂岩致密化成因及对油气成藏的影响  

DENSIFICATION GENESIS OF THE QUARTZ SANDSTONE IN SHANGSHIHEZI FORMATION OF GAOQING AREA AND ITS INFLUENCE ON THE PETROLEUM RESERVOIR ACCUMULATION

作　　者：杨少春[1,2] 赵永福 任瑞 王亚[1,2] YANG Shaochun;ZHAO Yongfu;REN Rui;WANG Ya(School of Geosciences in China University of Petroleum,Qingdao 266580,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China;Management Center of Oil and Gas Exploration,SINOPEC Shengli Oilfield,Dongying 257017,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [3]中国石化胜利油田分公司油气勘探管理中心,山东东营257017

出　　处：《大庆石油地质与开发》2018年第6期13-21,共9页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项课题"低渗-致密油藏描述新方法与开发模式"(2017ZX05009001);国家自然科学基金面上项目"基于重建三角洲储层构型的剩余油分布模拟实验研究"(41772138)

摘　　要：高青地区二叠系上石盒子组石英砂岩显示出较大的油气勘探潜力,但砂岩致密化程度高,其成因未明确。综合利用岩心观察、薄片鉴定、扫描电镜观察、X—衍射和阴极发光等分析测试手段,从沉积作用、成岩作用等方面对上石盒子组石英砂岩的致密化成因进行分析。结果表明:上石盒子组石英砂岩主要为河床滞留沉积,沉积作用对储层致密化的影响小;强烈的压实作用大量破坏原生孔隙空间,是导致储层致密化的首要因素;石英次生加大作用、黏土矿物胶结作用、方解石胶结作用破坏原有的孔隙空间,加强了其致密化程度;溶蚀作用产生少量次生孔隙,一定程度上减弱了石英砂岩致密化程度。上石盒子组石英砂岩致密化早于油气成藏时间,对油气聚集成藏起阻碍作用。研究成果对指导高青地区上石盒子组油气勘探部署具有重要意义。The quartz sandstones of Permian Shangshihezi Formation in Gaoqing area show great oil and gas exploration potentials, but the sandstones are highly densified, and the genesis of the densification is not clear. With the integrated help of the core observation, thin section petrographic analyses, scanning electron microscopy （SEM ）, X-ray diffraction, cathodeluminescence （CL ） and other analyzing-testing measures, the densified mechanism of the qua.rtz sandstones in Shangshihezi Formation was analyzed from the aspects of the sedimentation, diagenesis and so forth. The achievements show that the quartz sandstones of Shangshihezi Formation are mainly stagnated and deposited in the river bed, the sedimentation has a little effect on the densification of the reservoirs; the strong compaction destroys the primary pore space in a great deal and becomes the primary factor leading to the densification; the quartz overgrowing action, the clay mineral and the calcite cementations damage the original pore space and moreover strengthen the densification; dissolution produces a few secondary pores, which weakens the degree of the densification to a certain degree. The densified time of the quartz sandstone in Shangshihezi accumulation, which hinders the hydrocarbon accumulation. The Formation was earlier than that of the hydrocarbon research achievements possess important significances for guiding the petroleum exploration deployment of Shangshihezi Formation in Gaoqing area.

关 键 词：石英砂岩 致密化成因 压实作用 胶结作用 溶蚀作用 上石盒子组 高青地区 

分 类 号：TE122.2[石油与天然气工程—油气勘探]