周红飞, 戴鑫, 刘冉, 杨青, 范毅, 夏茂龙, 苑保国, 王文之. 大巴山前缘地区龙王庙组油气成藏条件[J]. 海洋地质前沿, 2019, 35(2): 58-64. DOI: 10.16028/j.1009-2722.2019.02008
    引用本文: 周红飞, 戴鑫, 刘冉, 杨青, 范毅, 夏茂龙, 苑保国, 王文之. 大巴山前缘地区龙王庙组油气成藏条件[J]. 海洋地质前沿, 2019, 35(2): 58-64. DOI: 10.16028/j.1009-2722.2019.02008
    ZHOU Hongfei, DAI Xin, LIU Ran, YANG Qing, FAN Yi, XIA Maolong, YUAN Baoguo, WANG Wenzhi. HYDROCARBON ACCUMULATION CONDITIONS OF LONGWANGMIAO FORMATION IN THE FRONT AREA OF THE DABA MOUNTAIN[J]. Marine Geology Frontiers, 2019, 35(2): 58-64. DOI: 10.16028/j.1009-2722.2019.02008
    Citation: ZHOU Hongfei, DAI Xin, LIU Ran, YANG Qing, FAN Yi, XIA Maolong, YUAN Baoguo, WANG Wenzhi. HYDROCARBON ACCUMULATION CONDITIONS OF LONGWANGMIAO FORMATION IN THE FRONT AREA OF THE DABA MOUNTAIN[J]. Marine Geology Frontiers, 2019, 35(2): 58-64. DOI: 10.16028/j.1009-2722.2019.02008

    大巴山前缘地区龙王庙组油气成藏条件

    HYDROCARBON ACCUMULATION CONDITIONS OF LONGWANGMIAO FORMATION IN THE FRONT AREA OF THE DABA MOUNTAIN

    • 摘要: 川中地区龙王庙组的天然气勘探已经取得重大发现,然而大巴山前缘地区龙王庙组尚未取得勘探突破,原因可能是缺少油气成藏条件研究。从烃源岩、沉积相、储层、构造条件等多方面入手,探讨了该区龙王庙组的油气成藏条件, 结果表明:①该区寒武系发育筇竹寺组优质烃源岩,烃源条件较好;②该区龙王庙组储层主要储集空间为粒间溶孔、晶间溶孔,储层呈现低孔、低渗特征,大巴山前缘地区龙王庙组的储层主要发育在台缘带颗粒滩叠合岩溶发育区城口—奉节—兴山—利川一带;③该区寒武系油气成藏条件好,“筇竹寺组烃源岩+龙王庙组储层+高台组厚层膏盐岩盖层”这套优越生储盖组合为油气藏的形成奠定了基础。圈闭形成时间与油气运移匹配,有利于油气聚集。在成藏条件分析的基础上,认为城口—巫山地区为大巴山前缘地区龙王庙组的有利勘探区带。

       

      Abstract: Significant natural gas has been discovered in the Longwangmiao Formation of the central Sichuan Basin. However, the Longwangmiao Formation in the front area of the Daba Mountain has remained an area lacking breakthrough. In this paper, we made a thorough review of the hydrocarbon accumulation conditions started from source rock, followed by sedimentary facies, reservoirs, structural conditions and other aspects, and discussed the hydrocarbon accumulation conditions of the Longwangmiao Formation in the front area of the Daba Mountain. Our results suggest that: (1) High-quality source rocks do occur in the Qiongzhusi Formation of Cambrian in this area and may provide good organic matters for hydrocarbon generation; (2) The main reservoir space of the Longwangmiao Formation in the study area are intergranular and intercrystalline dissolved pores with low porosity and low permeability. Reservoirs, however, may well developed in the Chengkou-Fengjie-Xingshan-Lichuan area where karstified carbonate beaches are well developed along the margin of platforms. (3) There are favorable assemblages of oil and gas accumulation conditions in the Cambrian of the region, which include the source rocks from Qiongzhusi Formation, reservoir of Longwangmiao Formation and a thick salt cover of Gaotai Formation. Trap forming time matches well with the timing of oil and gas migration, which is conducive to oil and gas accumulation. Based on the study of hydrocarbon accumulation conditions, it is believed that the Chengkou-Wushan area is the most favorable area for future oil and gas exploration.

       

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