TYPES AND CHARACTERISTICS OF TIGHT CLASTIC ROCK GAS POOLS IN THE WEST SICHUAN DEPRESSION
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摘要: 川西坳陷致密碎屑岩天然气藏的勘探开发经过几十年的艰苦历程,目前已发现不同地区、不同层位的天然气气藏20多个,取得了丰硕的天然气勘探成果,但是对于川西坳陷致密碎屑岩复杂气藏类型却一直没有统一、规范的划分方案.在总结区内已有气藏描述成果和勘探研究成果的基础上,以“圈闭成因”为分类的首要依据,以气藏地质结构中“致密化程度”和“压力状况”为亚类划分标准,提出了适合该区的气藏分类标准和划分方案,划分出构造-岩性型、构造-成岩型和构造-裂缝型3大类、5个亚类气藏类型,并对各种类型的典型气藏特征进行了描述.Abstract: After years of exploration and development, over 20 tight clastic rock gas pools have been found in different regions and formations in the West Sichuan Depression. However, there is no unified division standard for the types of tight clastic rock gas pool. Based on the achievements of gas pool description and exploration, according to the cause of trap and compaction and pressure, the division standard and method suitable for this region are put forward, thus dividing gas pools into 3 types (structure-lithology, structure-digenesis and structure-fracture) and 5 inferior types. The characteristics of typical pool types are also described.
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