摘要
四川盆地合川—潼南地区下二叠统栖霞组储层为白云岩,储层厚度超薄(单层厚度为1~7m),同时上、下地层岩性变化大,地震响应特征不明显,准确预测此套储层的分布是亟需解决的问题。为此,提出了一种有针对性的储层预测新方法。首先,通过层序划分及小层对比,明确了下二叠统白云岩储层主要发育在栖二段;其次,通过模型正演,分析了储层在不同地质背景下的地震响应特征;最后,分层段预测了栖二^(a)和栖二^(b)亚段白云岩储层的分布范围。应用本文方法对区内超薄储层进行预测的结果表明,与钻井结果的吻合度比直接利用地震属性和反演方法预测的结果提高了20%,部署的多口探井成功钻遇白云岩储层并获高产。
Dolomite reservoirs are developed in the Lower Permian Qixia Formation in the Hechuan-Tongnan area of the Sichuan Basin.The reservoirs are ultra-thin(single-layer thickness of 1-7m),and due to the rapid lithological change of the upper and lower strata,the seismic response characteristics are not obvious.Therefore,accurate prediction of the reservoir distribution is an urgent problem to be solved.This paper presents a new targeted method for reservoir prediction.Firstly,through sequence division and sub-layer comparison,it is determined that the Lower Permian dolomite reservoirs are mainly developed in the second member(Q2)of Qixia Formation.Secondly,the seismic response characteristics of reservoirs under different geological backgrounds are clarified through forward modeling.Finally,the distribution ranges of the dolomite reservoirs in the sub-members of Q2aand Q2bare predicted.The application results of the method in this paper to the prediction of ultra-thin reservoirs in the area show that the coincidence degree with the drilling results is 20%higher than that of reservoir prediction directly using seismic attributes and inversion methods.The deployed exploration wells have successfully drilled dolomite reservoirs and achieved high-yield gas flow.
作者
纪学武
李海银
杨波
闫群
邹雯
吕继
JI Xuewu;LI Haiyin;YANG Bo;YAN Qun;ZOUWen;LYU Ji(Geological Research Center,BGP Inc.,CNPC,Zhuozhou,Hebei 072750,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2022年第S02期74-79,227,共7页
Oil Geophysical Prospecting
关键词
四川盆地
栖霞组
白云岩
模型正演
储层预测
Sichuan Basin
Qixia Formation
dolomite
forward modeling
reservoir prediction
