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川西北地区双鱼石区块栖霞组膝折褶皱的发现及其油气意义
Kink folds discovered in Qixia Formation of the buried structural belt, northwestern Sichuan Basin: Their significance to oil and gas
梁 瀚 冉 崎 狄贵东 曾 鸣 韩 嵩 王跃翔
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作者单位:中国石油西南油气田公司勘探开发研究院
中文关键字:逆冲断块 构造变形 膝折带 早二叠世 整装气藏 四川盆地 双鱼石构造 龙门山前带
英文关键字:Thrust block; Tectonic deformation; Kink band; Early Permian; Monoblock gas reservoir; Sichuan Basin; Shuangyushi structure; Longmen piedmont belt
中文摘要:四川盆地西北部栖霞组台缘滩相白云岩储层广泛发育,油气储集条件好,新近发现①号断层下盘的隐伏构造带可延续并包含了双鱼石构造,栖霞组勘探有利面积增大,是四川盆地勘探开发领域的战略接替区。但隐伏构造带的构造变形机制复杂,以前仅有地震资料,没有实钻井钻进隐伏构造带的复杂翼部,故认为背斜—向斜之间发育高角度逆冲断层,栖霞组气藏是断块型气藏,该认识限制了对栖霞组气藏的整体认识和油气勘探开发部署。但近期钻到构造复杂带的实钻井测井倾角数据和高分辨地震精细成像攻关结果表明:①川西北地区隐伏构造带栖霞组大范围发育膝折褶皱,褶皱之间以高角度膝折带相连,并不发育大规模、延伸远的高角度逆冲断层;②膝折带为构造剪切带,膝折带内的储层裂缝发育,连通性强,是背斜和向斜的栖霞组储层的良好沟通渠道。该认识结合栖霞组储层在川西北地区连片分布的地质特征,结论认为:川西北地区隐伏构造带栖霞组气藏具备形成大型岩性—构造整装气藏的潜力。
英文摘要:With better oil and gas accumulation condition, dolomite reservoirs of marginal platform beach facies are widely developed in Qixia Formation, northwestern Sichuan Basin; moreover, a buried structural belt, newly discovered at the footwall of No.1 fault, extends to and contains Shuangyushi structure, expanding a favorable exploration area for Qixia Formation. The Qixia Formation in the buried structural belt becomes a strategic replacement area of exploration and development domains in Sichuan Basin. However,
for this belt, the tectonic deformation mechanism is complex; in addition, there is a little available seismic data and no wells actually drilled into its complex flank. As a result, some previous study deemed that a high-angle thrust fault is developed between anticline and syncline and Qixia Formation belongs to fault-block gas reservoirs. These points limit an overall understanding on Qixia reservoirs and their exploration and development deployment. Based on some dip data from actual drilling and logging into the complex structural belt and high-resolution fine seismic imaging, it is shown that, (1) in the buried structural belt, there are many kink folds connecting through kink bands, which are widely developed in Qixia Formation instead of large-scale, extensive, and high-angle thrust faults; and (2) inside these kink bands, also structural shear zones, fractures are developed with strong connectivity, which are better connecting pathway for Qixia reservoirs in both anticline and syncline. So, combined with some geological characteristics of Qixia
Formation massively developed in northwestern basin, it is concluded that gas reservoirs of Qixia Formation in the buried structural belt, northwestern Sichuan Basin, have great potential to form large-scale monoblock lithologic-structural ones.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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