Middle-late Miocene fault activity and its petroleum exploration significance of middle-shallow layers in the Xihu Sag, East China Sea
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摘要:
西湖凹陷中新世中晚期经历了强烈的挤压反转，发育了大量晚期活动断层。然而目前对中新世中晚期活动断裂类型、分布及性质的系统性认识不足，制约了浅部新层系油气勘探的进展。本文基于近年来西湖凹陷中西部地区三维连片地震解释成果，系统分析了西湖凹陷中西部中新世中晚期活动断裂的类型、分布及其性质，并在此基础上探讨断裂活动对中浅层油气勘探的指示意义。结果表明，该时期断裂在中浅层具有集中成带发育特征，受刚性基底差异分布所引起的局部应力场影响，不同区带断裂样式及性质呈现出明显多样性。其中，中央反转背斜带主要发育压性通源断裂，同时背斜核部伴生张性、张扭性悬挂断裂；西部斜坡带北段高带以发育张性通源断裂为主，南段发育压性通源断裂；西次凹局部发育具弱走滑特征的悬挂断裂。基于以上认识，认为凹陷北段中浅层具有较好的油气勘探前景，中央反转背斜带北段在压性通源断裂发育背景下，通过深层超压驱动，并经由悬挂断裂“接力中转”，利于油气在中浅层聚集成藏；西部斜坡带北段在张性通源断裂侧向封堵能力有限的条件下，西缘海礁隆起区潜山及上覆层系具备富集油气的有利条件。
Abstract:The Xihu Sag experienced strong compression inversion in the middle-late Miocene, and developed a large number of late active faults. However, the lack of systematic understanding of the type, distribution and properties of active fault in the middle-late Miocene has restricted the progress of oil and gas exploration in shallow and new strata. The type, distribution and property of the middle-late Miocene active fault in the central and western part of the Xihu Sag were systematically analyzed, based on which the fault activity significance of petroleum exploration in the middle-shallow layers was discussed. Results show that the fault is characteristic of concentrated zonation in this period, the fault properties and combination patterns in different zones show obvious diversity due to the change of local stress field caused by the distribution of rigid basement rock. Among them, the central inversion belt is dominated by compressional oil-source fracture, and the associated anticline core is mostly dominated by tension and torsion hanging fracture. The high belt of the western slope is dominated by tensional oil-source fracture in the northern section, and the southern section of the slope is dominated by compressional oil-source fracture. The western sub-sag is dominated by local hanging fracture, which has weak strike slip characteristics. Based on the above understanding, we considered that the middle-shallow layers in the northern section of the Xihu Sag are the replacement areas worthy of future exploration. In the northern section of the Central Inversion Belt, under the background of development of compressional oil-source fracture, driven by deep overpressure and "relay-transfer" through the hanging fracture, which is favorable for oil and gas accumulation in the middle-shallow layers. In the northern section of the western slope belt, under the condition of limited lateral sealing ability of tensional oil-source fracture, the buried hill and overlying strata in the convex area of the western margin have the conditions to capture hydrocarbon.
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Key words:
- fracture system /
- oil-source fracture /
- late-stage accumulation /
- middle-shallow layer /
- middle-late Miocene /
- Xihu Sag
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