川南阳新统气藏岩溶成因与气藏分布
ORIGIN OF KARSTIFIED GAS RESERVOIRS OF LOWER PWRMIAN(YANGXIN SERIES) AND THEIR DISTRIBUTION IN SOUTH SICHUAN
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摘要: <正>川南位于重庆、威远一线以南,包括泸州、自贡地区,该区二叠系阳新统残厚290～460米,为浅海碳酸盐台地沉积,富含藻类及多种底栖生物(图1)。1955年以来,四川石油管理局在该区进行天然气勘探、开发,获一批阳新统气藏,成为四川主力气藏之一,储集类型属裂缝—溶洞(孔)型。川南阳新统地层发育多种类型的古岩溶与深岩溶,为天然气主要赋存空间。气藏深岩溶形成主要与气藏气水演化密切相关,为“气藏凝析水溶蚀及其与地层水混合溶蚀”的溶蚀机理所形成。Abstract: Gas reservoirs of lower Permian (Yangxin Series ) are one of the major ones in south Sichuan Province. Such gas storage structures belong to fracture-karst cavern type. Based on the data obtained from gas exploration and development, karst phenomena of the lower Permian gas reservoirs may be classified according to their stage of formation and their burial depth into two different types: (1) paleokarst formed at the end of Dongwu epeirogenetic movement; and ( 2 ) deep karst formed after the Himalayan mov...
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