叠前反演技术在锦州31-6地区浊积扇砂体含油气性预测中的应用
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摘要
辽中凹陷锦州31-6区块东二段发育远源浊积扇沉积体系,形成东西两个浊积扇体。在地震剖面上表现为蠕虫状反射结构,叠后反演剖面上砂泥岩纵波阻抗差异小,含水砂岩和含气砂岩在叠后波阻抗剖面上无法区分,储层预测和烃类检测十分困难。以测井岩石物理分析为基础,应用叠前AVO同步反演技术对锦州31-6区块面积约165km2的三维地震资料进行叠前反演,并采用密度和剪切模量交会区分砂泥岩,采用纵横波速度比和拉梅常数交会预测气层分布,取得明显效果,可供邻区浊积扇体储层预测和油气检测借鉴,探索了一条在渤海湾开展隐蔽油气藏勘探的新路子。
In the Liaozhong sag, there is a distal turbidite depositional system in Dongying-2 Member of Jingzhou31-6 Block, where turbidite sand bodies developed in the east and west. It shows vermicular reflection configuration in the seismic profile. As there is little difference of p-wave impedance between sand and shale, between gas sand and wet sand in the poststack inversion profile, reservoir prediction and hydrocarbon detection are very difficult in this area. In this paper, on the basis of rock physics analysis, we adopt prestack AVO simultaneous inversion method to invert the JZ31-6 block prestack 3D seismic data with about 165km2. Then, we crossplot the density and shear modular from inversion result to distinguish the sand and shale, and crossplot the Vp/Vs and Lambda to detect the distribution of oil or gas. The result is well accepted and can be used as reference for reservoir prediction and hydrocarbon detection of turbidite nearby, which suggests a new thread for subtle reservoir exploration in Bohai Bay Basin.
In the Liaozhong sag, there is a distal turbidite depositional system in Dongying-2 Member of Jingzhou31-6 Block, where turbidite sand bodies developed in the east and west. It shows vermicular reflection configuration in the seismic profile. As there is little difference of p-wave impedance between sand and shale, between gas sand and wet sand in the poststack inversion profile, reservoir prediction and hydrocarbon detection are very difficult in this area. In this paper, on the basis of rock physics analysis, we adopt prestack AVO simultaneous inversion method to invert the JZ31-6 block prestack 3D seismic data with about 165km2. Then, we crossplot the density and shear modular from inversion result to distinguish the sand and shale, and crossplot the Vp/Vs and Lambda to detect the distribution of oil or gas. The result is well accepted and can be used as reference for reservoir prediction and hydrocarbon detection of turbidite nearby, which suggests a new thread for subtle reservoir exploration in Bohai Bay Basin.
引文
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[6]Daniel P Hampson, Brian H Russel. Simultaneous inversion of pre-stack seismic data. SEG/Houston2005 Annual Meeting, 2005:1633～1637.
[2]Connolly P. Elastic Impedance. The Leading Edge,1999,18(4):438～452.
[3]Goodway W, Chen T,Downton J. Improved AVO fluid Detection and Lithology Discrimination UsingLame Petrophysical Parameters, Extended Abstracts,Soc. Expl. Geophysics, 67th Annual International Meeting, Denver, 1997.
[4]高建荣,滕吉文,李明,等.AVO流体反演理论与实践[J].石油勘探与开发,2006,33(5):558～561.
[5]殷八斤,曾灏,杨在岩.AVO技术的理论与实践[M].北京:石油工业出版社,1995.
[6]Daniel P Hampson, Brian H Russel. Simultaneous inversion of pre-stack seismic data. SEG/Houston2005 Annual Meeting, 2005:1633～1637.
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