DIVISION AND IDENTIFICATION MARKS OF POOL-FORMING ENVIRONMENT IN XINCHANG GAS FIELD OF THE WEST SICHUAN DEPRESSION
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摘要: 新场气田是川西坳陷中最具规模的典型的多层含气、多类型气藏叠置而成的复杂气田。通过三维地震解释成果的精细描述,依据须家河组超压气源的压力分带、气水赋存状态以及所建立和预测的6类气藏类型,在提出了“成藏环境”这一多因素综合性概念的基础上,作者划分出新场气田5种不同成藏机制的成藏环境类型,并对各成藏环境的成藏条件和主控因素进行了分析,确定了各成藏环境的识别标志。Abstract: Xinchang gas field is a typical complex gas field in the West Sichuan Depression which has already taken shape and is bearing gas in multiple strata and superimposed by,ulti-type gas pools.Based on the pressure zonation and gas-water occurrence of overpressure gas source in the Xujiahe Formation as well as six types of gas pools established or predicted,the multi-factor comprehensive concept "pool-forming environment" is proposed by fine description of 3-D seismic interpretation results. Furthermore,five types of pool-forming environment with different pool frming mechanism are classified in Xinchang gas field,the pool-forming conditins and,main controlling factors of each pool-forming environment are analysed,and the identification marks of each pool-forming environment are suggested.
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