摘要
四川盆地开江-梁平海槽南侧二叠系长兴组生物礁发育,生物礁有利相带窄且横向变化快,单体礁、点状礁较多,礁体不易准确刻画,导致钻井一次钻遇生物礁成功率低,因而需要提高生物礁的地震预测精度,实现效益开发。以“双高”处理后的高保真、高分辨率三维地震资料为基础,建立不同储层厚度及速度的生物礁储层正演模型,结合实钻井情况明确生物礁地震响应的基本特征,即生物礁具有上覆和下伏标志层“上凸下凹”的地震响应特征;利用古地貌恢复技术划分生物礁有利相带,采用基于短时傅里叶变换的谱分解分析技术刻画礁群内幕及单礁体,并采用三维立体雕刻技术对生物礁体进行空间刻画,明确了礁群之间及礁群内单礁体的边界。结果表明,利用这套生物礁预测方法精细刻画了生物礁,刻画结果客观可靠。该预测方法还适用于海槽两侧大部分地区的生物礁预测,具有一定的推广应用前景。
Permian Changxing Formation reefs developed in the south of the Kaijiang-Liangping trough in the Sichuan Basin.The favorable facies of the reefs are narrow and change rapidly laterally,and the presence of many single reefs and point reefs are noted;thus,it is difficult to characterize reefs,and the drilling success rate is low.Therefore,the key to improving the success rate of drilling is to accurately describe reefs.The foundation is based on the hi-fi and high-resolution three-dimensional(3D)seismic data processed by“double height.”The first step is to establish the forward modeling of reef reservoir with different reservoir thickness and velocity,and the basic characteristics of seismic response of reefs are determined by using the actual drilling conditions.The seismic response characteristics of reefs are summarized as follows:reefs have“upward convex and downward concave”overlying and underlying marker layers,transverse phase change and so on.The paleogeomorphic restoration technology residual thickness method is used to divide the favorable facies zones of reefs,spectral decomposition analysis technology based on short-time Fourier transform is used to characterize the reef group and single reef of the Changxing Formation reefs,and 3D space carving technology is used to characterize the reefs to clarify the boundaries between reefs and single reefs within reefs.Therefore,this set of reef prediction methods can describe reefs more effectively and finely,and the characterization results are more objective and reliable.This technology has broad prospects for popularization and application.
作者
何思进
杨荣荣
朱中华
徐敏
李宝
周政
HE Sijin;YANG Rongrong;ZHU Zhonghua;XU Min;LI Bao;ZHOU Zheng(Southwest Geophysical Research Institute of BGP Inc.,CNPC,Chengdu 610055,China)
出处
《石油物探》
CSCD
北大核心
2023年第2期327-335,344,共10页
Geophysical Prospecting For Petroleum
基金
中国石油天然气股份有限公司重大科技专项(2016E-0607)资助。
关键词
四川盆地
生物礁
地震响应特征
谱分解
三维立体雕刻
Sichuan Basin
reefs
seismic response characteristics
spectral decomposition
3D space carving
