四川盆地东部卧龙河地区茅口组白云岩储层地震响应特征  

Seismic-response characteristics on dolomite reservoirs of Maokou Formation,Wolonghe area,eastern Sichuan Basin

作　　者：何昌兴悦 陈康 李承泽 王浩[1] 龙隆 李珂芮 HE Changxingyue;CHEN Kang;LI Chengze;WANG Hao;LONG Long;LI Kerui(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610041,China;PetroChina Research Institute of Petroleum Exploration and Development–Northwest,Lanzhou,Gansu 730020,China)

机构地区：[1]中国石油西南油气田勘探开发研究院,四川省成都市610041 [2]中国石油勘探开发研究院西北分院

出　　处：《天然气勘探与开发》2023年第4期107-115,共9页Natural Gas Exploration and Development

基　　金：“十三五”国家科技重大专项“大型油气田及煤层气开发——四川盆地大型碳酸盐岩气田开发示范工程”(编号:2016ZX05052-001)。

摘　　要：四川盆地东部地区中二叠统茅口组岩溶储层与气藏的成功勘探依赖于储层地震响应特征与模式的识别,由于前期勘探主要集中在石灰岩裂缝岩溶型储层,对川东卧龙河地区孔隙型白云岩储层的地球物理响应特征研究较少,未能做到最优勘探部署和高效开发。为此,综合地震及钻井资料,总结白云岩储层的测井响应特征及井震响应特征,通过地震正演模拟厘清了茅口组白云岩纵向发育模式和实际地震响应特征,最后利用地震属性进行了白云岩储层分布的地震预测。研究结果表明:①川东卧龙河地区茅口组孔隙型白云岩储层在测井上表现为“三低”的特征,即相对低纵波速度、低自然伽马和低电阻率的特征;②在地震上,储层底界具有中弱波峰反射,由于平面分布的非均质性,储层底界横向上可表现为断续波峰反射的响应模式;③优选最大波峰振幅属性可以对储层和有利相带进行有效识别。For both karst reservoirs and gas reservoirs of the Middle Permian Maokou Formation,eastern Sichuan Basin,the success-ful exploration depends on the identification of their seismic-response characteristics and patterns.The early exploration was mainly concentrated around fractured limestone karst reservoirs whereas a little study on geophysical-response characteristics of porous do-lomite reservoirs in Wolonghe area of eastern basin,impeding the supreme exploration deployment and efficient development.Thus,based on seismic and drilling data,the well-logging and well-to-seismic response characteristics were summed up for the dolomite reservoirs.Then,not only longitudinal development pattern but actual response characteristics were figured out for the dolomite res-ervoirs of Maokou Formation after forward modeling.Finally,the reservoir distribution was predicted by using seismic attribute.Re-sults show that(i)the porous dolomite reservoirs of Maokou Formation in Wolonghe area possess three-low features in terms of well logging,for example relatively low P-wave velocity,and low natural gamma and resistivity;(ii)seismically,the reservoir bottom has weak to moderate moderate peak reflection.Due to its heterogeneous extension on the plane,this bottom presents a response pattern of intermittent peak reflection laterally;and(iii)the reservoirs and favorable facies belts can be identified by means of optimized maxi-mum peak amplitude with effect.

关 键 词：四川盆地 卧龙河 中二叠世 白云岩 地震响应 储层识别 

分 类 号：P618.13[天文地球—矿床学] P631.4[天文地球—地质学]