川东高峰场地区大安寨段地震地质特征及油气意义  

Seismic geological characteristics and petroleum significance of Da’anzhai formation in Gaofengchang block,Eastern Sichuan

作　　者：赵虎[1,2] 杨丰齐 王轶 廖义沙 陈康 李世临[4] 王琼[6] ZHAO Hu;YANG FengQi;WANG Yi;LIAO YiSha;CHEN Kang;LI ShiLin;WANG Qiong(Sichuan Province University Key Laboratory of Natural Gas Geology,SWPU,Chengdu 610500,China;School of Geoscisence and Technology,Southwest Petroleum University,Chengdu 610500,China;Petrochina Southwest Oil and Gas field Company Exploration Division,Chengdu 610041,China;PetroChina Southwest Oil and Gasfield Company Chongqing Gas District,Chongqing 400707,China;Exploration and Development Research Institute,PetroChina Southwest Oil and Gasfield Company,Chengdu 610041,China;School of Electrical Engineering and Information,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学天然气地质四川省重点实验室,成都610500 [2]西南石油大学地球科学与技术学院,成都610500 [3]中国石油西南油气田公司勘探事业部,成都610041 [4]中国石油西南油气田分公司重庆气矿,重庆400707 [5]中国石油西南油气田公司勘探开发研究院,成都610041 [6]西南石油大学电气信息学院,成都610500

出　　处：《地球物理学进展》2022年第5期2097-2109,共13页Progress in Geophysics

基　　金：中国石油-西南石油大学创新联合体科技合作项目(2020CX010201);国家自然基金青年科学基金(41704134)联合资助。

摘　　要：川东地区大安寨段受湖相沉积背景影响,形成了一套湖相的介壳灰岩和页岩,具有厚度稳定、分布范围大、生储组合好和烃源岩厚等优点,显示其有较好的勘探前景.但也存在灰岩储层岩性致密、储层较薄、孔渗低、勘探难度大等问题,所以一直未受到足够的重视,针对这一问题,本文从地震地质资料入手,详细分析大安寨段纵横向地震地质特征,研究发现灰岩发育在大安寨段上部,中下部页岩发育较厚,生储组合好,烃源和油气保存条件较好.储层甜点区受相带控制,高能的介壳滩为有利的储集体,储层总厚度在4~22 m不等,下部页岩厚度在10~45 m之间,部分井区达到了45 m,平均TOC值在0.8以上,局部达到了1.5,为灰岩及页岩兼探提供了有利的条件,裂缝发育的向斜区为有利的勘探区.Affected by the lacustrine sedimentary setting,Da’anzhai formation in Eastern Sichuan has formed a Lacustrine scale limestone and shale,which possesses a lot of advantages,such as stable thickness,wide distribution,good source reservoir combination and thick source rock,showing that it has quite good prospect.However,there are many problems,for instance,the lithology of limestone reservoir is tight,thinner reservoir,lower porosity,permeability and difficult prospection,so far,it has not obtain adequate importance.In the light of the problem,this paper embarks on seismic material and analysis vertical and horizontal seismic geological characteristics about Da’anzhai formation,it is found that the limestone is developed in the upper part of Da’anzhai formation,and the shale is developed in the middle and lower part and is very thick,with good source reservoir combination and good hydrocarbon source and preservation conditions.The dessert area of reservoir is controlled by facies zone.The high-energy shell beach is the profitable reservoir.The reservoir’s total thickness is 4~22 m,and the thickness of lower shale is 10~45 m.The thickness of some wells is 45 m,the average TOC value is above 0.8,and the local TOC value is 1.5,which supplies profitable terms for the exploration of limestone and shale.The syncline area with fracture development is a favorable exploration area.

关 键 词：川东地区 大安寨段 致密储层 地震地质特征 

分 类 号：P631[天文地球—地质矿产勘探]