| 文昌B凹陷差异伸展- 走滑机制及控藏作用研究 |
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| 引用本文： | 江汝锋,周家雄,杨希冰,游君君,李珊珊,陈林,张霞.文昌B凹陷差异伸展- 走滑机制及控藏作用研究[J].地质学报,2020,94(8):2422-2432. |
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| 作者姓名： | 江汝锋 周家雄 杨希冰 游君君 李珊珊 陈林 张霞 |
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| 作者单位： | 中海石油(中国)有限公司湛江分公司，广东湛江，524057 |
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| 基金项目： | 本文为国家科技重大专项“南海西部海域低渗油藏勘探开发关键技术”(编号 2016ZX05024- 006)资助成果。 |
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| 摘 要： | 为查明文昌B凹陷油气富集差异性的原因，基于断裂展布和形成期次、构造样式组合、构造演化和断层活动的差异等标志，建立了差异伸展- 走滑机制，识别出19洼为伸展- 强走滑、14洼为伸展- 中等走滑、30洼为伸展- 弱走滑。差异伸展- 走滑作用控制了优质烃源岩的展布和供烃方向，控制输导体系类型和运移动力，提供物源通道和改造储层，还控制了圈闭类型和力学性质。进一步深化了走滑增压理论，基于先存断裂形态、伸展应力场右旋演化和应变差异，建立了走滑增压圈闭识别方法，识别出S型增压、右行左阶增压、斜交型增压3种走滑增压构造。研究表明，文昌B凹陷的油气富集受伸展- 走滑构造背景、源- 运时空配置关系所控制，强—中等走滑变形、发育优质中深湖源岩的文昌19洼和14洼是油气富集区。该研究成果成功推动了文昌凹陷近期的多个勘探发现。
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| 关 键 词： | 差异伸展- 走滑 控藏作用 走滑增压 文昌凹陷 珠三坳陷 珠江口盆地西部 |
| 收稿时间： | 2019/6/25 0:00:00 |
| 修稿时间： | 2020/3/31 0:00:00 |
The different extension and strike- slip mechanism and its accumulation controlling effect in Wenchang B sag |
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| JIANG Rufeng,ZHOU Jiaxiong,YANG Xibing,YOU Junjun,LI Shanshan,CHEN Lin,ZHANG Xia.The different extension and strike- slip mechanism and its accumulation controlling effect in Wenchang B sag[J].Acta Geologica Sinica,2020,94(8):2422-2432. |
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| Authors: | JIANG Rufeng ZHOU Jiaxiong YANG Xibing YOU Junjun LI Shanshan CHEN Lin ZHANG Xia |
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| Institution: | Zhanjiang Branch of China National Offshore Oil Corporation (CNOOC) Limited, Zhanjiang, Guangdong, 524057 |
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| Abstract: | The different extension and strike- slip mechanism was built to understand the mechanisms responsible for differences in hydrocarbon enrichment in Wenchang B sag, based on fault distribution and formation periods, structural styles and combination, the difference in tectonic evolution and fault activity. The results indicate that the Sub- sag 19 was in extension and strong- strike- slip setting, Sub- sag 14 in extension and medium- strike- slip setting, and Sub- sag 30 in extension and medium- strike- slip setting. The different extension and strike- slip not only provided source channels and reformed reservoirs but also controlled the distribution and expelling direction of source rocks, the carrier system types and migration dynamic, the trap types and mechanical properties. Moreover, based on the pre- existing fault form, dextral evolution of extensional stress field and strain difference, a recognition method of strike- slip stress- increased traps was built and divided into 3 types: such as S- shaped stress- increased traps: dextral left- step stress- increased traps; and skew- shaped stress- increased traps. In conclusion, the hydrocarbon enrichment in Wenchang B sag was controlled by the extension and strike- slip setting and source- migration configuration, Sub- sag 19 and 14 were hydrocarbon enrichment region owing to strong- medium strike- slip setting and excellent source rocks in semi- deep lacustrine facies. Finally, the study has promoted several exploration discoveries in the Wenchang sag. |
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| Keywords: | different extension and strike- slip accumulation controlling effect strike- slip stress- increased Wenchang sag Zhu- 3 depression western Pearl River Mouth basin |
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