珠江口盆地西南部深水区S1构造油气储层预测与烃类检测  

Reservoir prediction and hydrocarbon detection in S1 structure in the deep water area of the Southwestern Pearl River Mouth Basin

作　　者：吴其林 房晓璐[2] 杜增利 于俊峰 王身建 刘大伟 孙雷鸣 WU QiLin;FANG XiaoLu;DU ZengLi;YU JunFeng;WANG ShenJian;LIU DaWei;SUN LeiMing(School of Petroleum Engineering,Guangdong University of Petrochemical Technology,Maoming 525000,China;Exploration and Development Research Institute,Northwest Oilfield Branch,Sinopec,Vriimqi 830011,China;Tepu GE0-C0SL,CN00C,Zhanjiang 524051,China)

机构地区：[1]广东石油化工学院石油工程学院,茂名525000 [2]中国石化西北油田分公司勘探开发研究院,乌鲁木齐830011 [3]中海油服物探事业部特普公司,湛江524057

出　　处：《地球物理学进展》2022年第1期450-459,共10页Progress in Geophysics

基　　金：广东石油化工学院人才引进项目(2018RC07);广东省自然科学基金(2019A1515012235);广东省高校特色创新项目(2020KTSCX084)联合资助。

摘　　要：储层预测与烃类检测是深海油气勘探决策的关键环节,关系到深海油气勘探部署.然而,受海上钻井稀疏(甚至没有钻井)、缺乏测井资料、3D地震资料等不利因素,深海油气储层预测与烃类检测面临极大的技术挑战.本文以南海珠江口盆地西南部深水区S1构造研究为例,在研究区没有钻井、仅7条长63 km的二维地震测线的资料条件下,以邻区相似构造背景的荔湾凹陷LW-X井岩石物理分析入手,确定了波阻抗识别含气砂岩的可行性.同时,井-震AVO正演模拟确定了研究区AVO含气异常类型,即5%低含气时表现为第三类AVO异常,15%以上高含气时为第四类AVO异常,利用P·G与标量泊松比相结合识别含气砂岩.最终形成以叠后波阻抗反演与叠前AVO分析相互验证的方法组合,开展了深水无井区储层预测与烃类检测,预测结果表明S1构造具备大型气藏的勘探规模,为该区的下一步勘探部署提供了依据.Reservoir prediction and hydrocarbon detection are key methods in deep-sea oil and gas exploration decisions, and are related to deep-sea oil and gas exploration and deployment. However, due to sparse offshore drilling(even without drilling), lack of logging data, 3 D seismic data and other unfavorable factors, deep sea oil and gas reservoir prediction and hydrocarbon detection are facing great technical challenges. This paper takes the S1 structure study in the deep water area of the southwestern Pearl River Mouth Basin as an example. Under the conditions of no drilling and only 7 two-dimensional seismic lines with a length of 63 km, the Liwan Sag LW-X with similar structural background in the adjacent area is used Well rock physical analysis was started to determine the feasibility of wave impedance to identify gas-bearing sandstone. At the same time, the well-seismic AVO forward modeling confirmed the type of AVO gas anomaly in the study area, that is, the third type AVO anomaly appears at 5% low gas content, and the fourth type AVO anomaly when more than 15% high gas content. The combination of P·G and scalar Poisson’s ratio to identify gas-bearing sandstone. Finally, a combination of post-stack wave impedance inversion and pre-stack AVO analysis mutual verification method was developed to carry out reservoir prediction and hydrocarbon detection in deep-water well-free areas. The prediction results show that the S1 structure has the exploration scale of large gas reservoirs, which is Provides the basis for the next step of exploration and deployment.

关 键 词：深水区 珠海组 波阻抗反演 标量泊松比 AVO反演 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]