Medium-deep gas accumulation and exploration prospects in the Jinma-Juyuan district, Sichuan
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摘要: 笔者通过对四川盆地川西坳陷金马-聚源地区中深层成藏条件的地质综合研究,认为金马地区中深层油气成藏主要有四个有利条件:①上三叠统须家河组具有充足的气源;②适时的燕山期古圈闭;③良好的辫状河三角洲砾-砂-泥储盖组合;④喜马拉雅期断层、裂缝对储集层的改善作用。从而进一步确立了该构造中深层为受燕山古隆起和有利岩相带控制的岩性-构造复合圈闭类型的气藏,指出了金马及其以西地区是龙门山中深层天然气勘探的重点,为龙门山中深层天然气勘探开发指明了方向。Abstract: The prerequisites for the medium-deep gas accumulation in the JinmaJuyuan district, Sichuan include:(1) sufficient gas sources in the Xujiahe Formation; (2) opportune Yanshanian palaeo-traps; (3) well-developed braided river-deltaic conglomerate-sandstone-mudstone reservoir-seal associations, and (4) betterment of the hy drocarbon reservoirs by the Him alayan faults and fractures.The medium-deep intervals are interpreted as the composite structural-lithologic traps governed by the Yanshanian palaeo-uplift and suitable sedimentary facies zones. The Jinma district and other areas west of it may thus be delineated as the target areas of the medium-deep natural gas exploration and development in the Longmen Mountains.
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Keywords:
- Jinma-Juyuan district /
- natural gas /
- accumulation /
- exploration prospects
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