川西深层雷口坡组低频复杂反射储层的AVO类型判别及含气性识别  

AVO type identification and gas-bearing identification of low frequency complex reflection reservoirs in the deep Leikoupo formation in western Sichuan

作　　者：张家乐 程冰洁[1,2] ZHANG Jiale;CHENG Bingjie(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China;Key Laboratory of Earth Exploitation and Information Technology of Ministry of Education,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学地球勘探与信息技术教育部重点实验室,成都610059 [2]成都理工大学“油气藏地质及开发工程”国家重点实验室,成都610059

出　　处：《物探化探计算技术》2022年第5期548-559,共12页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然基金(42074160)。

摘　　要：川西深层雷口坡组四段上部储层埋藏较深,横向非均质性较强,地震资料主频较低。常规地震资料上整体表现为反射强度弱、同相轴不清晰等特征,对储层预测造成了极大的困扰。为了突出AVO响应特征,这里采用反Q补偿、NMO、剩余静校正、拉冬变换等技术,对研究区目标地层的叠前地震数据进行了优化处理。在优化叠前CRP地震道集的基础上,利用测井、地质数据建立AVO正演分析模型。通过对比正演数值模拟和实测地震数据,确定上下储层的AVO含气响应类型,避免进行错误的AVO属性参数解释,从而指导实测地震数据AVO属性的分析应用。结合雷口坡组AVO正演模拟的认识,通过AVO反演获得截距、梯度、拟泊松比和流体因子等AVO含气属性参数,探索工区储层的叠前地震响应规律,本工区碳酸盐岩储层含气性识别结果表明,研究区含气储层分布面积广泛,勘探开发潜力巨大。The upper part of the fourth member of Leikoupo formation in the deep western Sichuan basin is deeply buried with strong lateral heterogeneity and low dominant frequency of seismic data.The characteristics of conventional seismic data are weak reflection intensity and unclear event axis,which cause great trouble to reservoir prediction.In order to highlight the characteristics of the AVO response,we use techniques such as inverse Q compensation,NMO,residual static correction,and rawdon transformation to optimize the pre-stack seismic data of the strata in the work area.On the basis of optimizing the pre-stack CRP seismic gathers,the AVO forward analysis model is established using logging and geological data.By comparing forward numerical simulation and measured seismic data,determine the AVO gas response type of the upper and lower reservoirs.This can avoid wrong interpretation of AVO attribute parameters and guide the analysis and application of AVO attributes.Combined with AVO seismic attributes such as intercept,gradient and fluid factor,the pre stack seismic response law of reservoir in the work area is explored to achieve the purpose of gas bearing property identification in carbonate reservoir.The identification results of gas bearing properties of carbonate reservoirs in this work area show that the gas bearing reservoirs in the study area are widely distributed and have great exploration and development potential.

关 键 词：川西深层雷口坡组 低频复杂反射 含气性识别 AVO属性 储层预测 

分 类 号：P631.4[天文地球—地质矿产勘探]