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Main Controlling Factors of Accumulation and Exploration Breakthrough of Deep-Water Submarine Fan Lithologic Trap in the Qiongdongnan Basin
You Li, Jiang Rufeng, Gong Yu, Xu Shouli, Zhan Yeping, Zheng Fei, Han Jianhui
PDF(7362 KB)
PDF(7362 KB)
Main Controlling Factors of Accumulation and Exploration Breakthrough of Deep-Water Submarine Fan Lithologic Trap in the Qiongdongnan Basin
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To study the key problems restricting exploration are the traps effectiveness and gas enrichment rule. Based on the analysis of submarine fan reservoir characteristics, trap formation and lateral sealing conditions, natural gas migration and accumulation, the main controlling factors of deep-water submarine fan traps large-scale accumulation is researched. The results show that: (1)The submarine fan coming from Hainan uplift is mainly distributed in the northern slope area, and the submarine fan in the depression zone coming from the western Kunsong uplift develop large-scale advancing far into the sag, and the physical properties of the reservoir become better. (2)The types of trap lateral sealing mechanisms are establishing, including sealed by mudstone channel type, sealed by sandstone channel type, lithological pinch-out type and fault lateral sealing type. (3)The mature to high mature natural gas of Meishan submarine fan were supplied by source rock of Yacheng formation, Accumulation mode was large-scale structural ridge convergence in source rock, vertical and lateral migration system with fault or fracture and sandstone, and effective traps cotrolling accumulation. It has been made breakthroughs in lithological pinch-out type and sealed by mudstone channel type, and the next expansion direction is explicited.
Qiongdongnan Basin / Ledong-Lingshui sag / deep-water / miocene / submarine fan / Trap conditions / main factors controlling of accumulation / petroleum geology
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