文献类型：期刊文献

英文题名：Wavefield characteristics of common-scatterpoint gathers and their application to seismic processing and interpretation in the Yin?e Basin

作者：Gou, Limin[1];Zhang, Zijian[2];Zeng, Xianjun[3];Li, Canping[4];Zhang, Yulin[5];Yan, Lizhi[6]

机构：[1]China Univ Geosci, Sch Ocean Sci, Beijing, Peoples R China;[2]Tsinghua Univ Shenzhen, Res Inst, Shenzhen, Peoples R China;[3]Guangzhou Marine Geol Survey, Guangzhou, Peoples R China;[4]Guangdong Ocean Univ, Sch Elect & Informat Engn, Zhanjiang, Peoples R China;[5]Jilin Oilfield Co, Geophys Explorat Res Inst, PetroChina, Songyuan, Peoples R China;[6]North China Petr Bur, Sinopec, Zhengzhou, Peoples R China

年份：2023

卷号：88

期号：2

起止页码：B55

外文期刊名：GEOPHYSICS

收录：SCI-EXPANDED(收录号：WOS:000983282600004)、、EI(收录号：20230813610505)、Scopus(收录号：2-s2.0-85148296116)、WOS

基金：The study work was funded by grants from the National Key Research and Development Pro-gram of China (no. 2018YFE0208200) , the Shenzhen Overseas High-level Talent Project (no. KQTD20200820113011026) , and the Intro-duction and Education Program of ?Pilot Plan?by the Innovation and Entrepreneurship Term of Zhanjiang City (no. 211207157080994) . The seismic data used in the paper were collected by the staff of the Sinopec North China Petroleum Bureau. We thank these staff for their hard work and professionalism during data collection. We are grateful to A. Malcolm, K. Innanen, and two anonymous reviewers for constructive comments and suggestions that improved the manuscript. We also thank X. Wang and X. Guo for their review and conductive suggestions for the paper.

语种：英文

外文关键词：Igneous rocks - Image enhancement - Petroleum prospecting - Sedimentary rocks - Seismic prospecting - Seismology

外文摘要：The Yin'e Basin, lying in the west of the Inner Mongolia Autonomous Region of China, embodies a complex geologic setting involving diverse and deformed strata of sedimentary and igneous rocks. Two-dimensional seismic data, collected in the western portion of the basin for the frontier exploration of oil and gas, are highly complicated with low signal-to-noise ratio and interference of reflected and diffracted waves. Seismic imaging using conventional technologies was poor, and the sub-surface structures and strata were unreliable for interpretation. We have applied an integrated processing-and-interpretation method based on seismic wavefield characteristics of common-scatterpoint (CSP) gathers to deal with the exploration chal-lenges. First, we enhanced the amplitude of signals and distin-guished weak signals from coherent noises by their kinematic characteristics. The signals, including reflected and diffracted waves, appear as scattered waves with highlighted hyperbolic curves, characterized by the vertex of the hyperbola coinciding with the subsurface scatterpoint and the curvature determined by the root-mean-square velocity of the overlying medium. In con-trast, the coherent noises, such as surface and refracted waves, present nearly linear curves with remarkably intensified ampli-tude in CSP gathers. Then, we established an accurate velocity model and investigated the thickness of the strata. Finally, we ran a prestack time migration (PSTM) for reflected and diffracted waves. The images were improved by mapping signals to the correct position with accurate velocity; therefore, the target strata and the fault planes, with the higher lateral resolution, were more visible. With the aid of well control and the velocity model, main faults and target sequences over the surveyed area were interpreted. Our CSP-gather processing technique not only has enabled us to reveal subsurface complex-ities and reach the exploration target in the area but also has implications for seismic explorations in similar environments where structures and sequences vary dramatically.