川东石炭系断层圈闭气藏
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摘要
川东石炭系已发现断层圈闭气藏占川东石炭系气藏总数的５７．９％，勘探成功率５５％。本文按形成方式和形态，将川东石炭系断层圈闭分为８类。这些圈闭一般都具有较好的遮挡条件，其中以半背斜、地垒背斜和逆断层上盘窄带状类型的圈闭条件最好。前二者勘探成功率大于６０％；后者孔缝发育，高产井多。已知圈闭尚有２／３未钻探。随着地震工作的增加，新发现的圈闭还会增多。进一步勘探时如能充分考虑石炭系残余厚度、沉积相变化，精选好井位，勘探成功率将会更高。
Faulted Carboniferious gas reservoirs with trap have been found in the eastern part of Sichuan, the 70 of fatuled gas reservoir is 57.9% of Carboniferous gas reservoir, and exploration success ratio is 55%. The paper Classify Carboniferous fault trap in the eastern part of Sichuan into eight types according to their modeand shape, these fault traps generally have better barrier condition. Those characterized by semi-anticline,horst anticline, upthrust with strip shape are the best, the exploration success ratio of the first two trap type is more than 60%; while porse and fractures in the last one are well developed, and many prolific gas wells occur. On the other hand, two thirds of known structures hasn't been exploratary drilled, with more seismic work, more favorable structures will be found. Exploration success ratio will be improved if remnant thickness of the carboniferous, changes of sedforentary factes and carefully selection of well situs are fully considered.
Faulted Carboniferious gas reservoirs with trap have been found in the eastern part of Sichuan, the 70 of fatuled gas reservoir is 57.9% of Carboniferous gas reservoir, and exploration success ratio is 55%. The paper Classify Carboniferous fault trap in the eastern part of Sichuan into eight types according to their modeand shape, these fault traps generally have better barrier condition. Those characterized by semi-anticline,horst anticline, upthrust with strip shape are the best, the exploration success ratio of the first two trap type is more than 60%; while porse and fractures in the last one are well developed, and many prolific gas wells occur. On the other hand, two thirds of known structures hasn't been exploratary drilled, with more seismic work, more favorable structures will be found. Exploration success ratio will be improved if remnant thickness of the carboniferous, changes of sedforentary factes and carefully selection of well situs are fully considered.
引文
1陈宗清．试沦碳酸盐岩断层圈闭油气藏地质条件－－川东石炭系断层圈闭油气藏勘探实践．地质论评，1986，22（4）：374～3832陈宗清．川南地区地震反射波强弱与二、三叠系气藏气水分布关系石油与天然气地质，1994，15（1）：12～22
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