复杂岩性背景下储层地震反射特征研究

doi:10.11885/j.issn.1674-5086.2020.11.27.03

摘要/Abstract

摘要： 川中古隆起北斜坡风险探井JT1井在寒武系沧浪铺组测试获气51.62$\times$10$^4$~m$^3$，实现了四川盆地沧浪铺组油气勘探首次突破。但是沧浪铺组为混积相，其复杂的岩性造成了内幕地震响应特征复杂，且前期针对沧浪铺组研究程度极低，并未系统开展过地球物理研究，给勘探推进工作带来了极大困难。基于此，综合钻井及地震资料，围绕川中地区沧浪铺组岩相及储层的地震响应模式开展了研究，结果表明：1）川中地区沧浪铺组存在5种岩相-地震相反射模式，其中，单轴模式和单轴复波模式为最优质的碳酸盐岩地震相。2）SOM波形聚类方法和波阻抗反演验证了地震相的准确性，可以进一步精细刻画沧浪铺组内部碳酸盐岩分布。3）古隆起北斜坡沧浪铺组存在两种优质储层地震反射模式，薄互层储层为岩性界面强轴伴复波模式，厚储层为岩性界面强轴伴亮点模式。综合研究认为，北斜坡沧浪铺组发育3个呈NW—SE向条带状展布的有利区，具有形成岩性圈闭的良好条件，合计面积达1~270~km$^2$，是下一步勘探的重点领域。建立了一套针对川中地区沧浪铺组复杂岩性背景下储层地震反射特征研究方法，为混积相薄储层地震预测提供了有效的研究思路。

关键词: 混积相, 川中地区, 沧浪铺组, 地震反射模式, 波阻抗反演

Abstract: 51.62$\times$10$^4$ m$^3$ of gas was obtained of the risk explororation Well JT1 from the Canglangpu Formation on the northern slope of the paleouplift in Central Sichuan during test. That is the first breakthrough in oil and gas exploration of Canglangpu Formation in Sichuan Basin. However, as the mixed sedimentary facies, the Canglangpu Formation has complex seismic response characteristics of which results in low degree of geophysical study due to its complex lithology. Thus, the seismic reflection characteristics of lithofacies and seismic response model of reservoirs of Cangchuan Formation in central Sichuan Basin are studied based on the drilling data and seismic data. The results show: 1) Canglangpu Formation in Central Sichuan has five lithofacies-seismic reflection modes, among which uniaxial mode and uniaxial complex wave model are the best seismic facies of carbonate rocks. 2) SOM waveform clustering method and wave impedance recursive inversion verify the accuracy of seismic facies, so the carbonate rocks can be further finely depicted. 3) there are two seismic reflection modes of high-quality reservoirs in Canglangpu Formation on the north slope of the paleouplift in central Sichuan Basin. The seismic reflection model of thin-interbedded reservoir is lithologic interface strong axis with complex wave, the seismic reflection model of thick reservoir is lithologic interface strong axis with bright spot. Comprehensive study shows that there are three favorable areas distribute in the shape of stripe in the NW--SE direction in Canglangpu Formation on the north slope and have good conditions for the formation of lithologic traps, with a total area of 1 270 ${\rm {km}}^2$, which is an important area for further exploration. In this paper, one method for research of seismic reflection characteristics of reservoir under complex lithology background is proposed to provide an effective idea for seismic prediction of thin reservoirs as sedimentary facies.

Key words: hybrid facies, central Sichuan Basin, Canglangpu Formation, seismic reflection pattern, wave impedance inversion

中图分类号:

TE122

代瑞雪, 郗诚, 冉崎, 陈康, 梁瀚. 复杂岩性背景下储层地震反射特征研究[J]. 西南石油大学学报(自然科学版), 2023, 45(2): 21-31.

DAI Ruixue, XI Cheng, RAN Qi, CHEN Kang, LIANG Han. A Study on Seismic Reflection Characteristics of Reservoir Under Complex Lithology Background[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(2): 21-31.

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