中国南方油气晚期成藏勘探实践及讨论

PRACTICE AND DISCUSSION ON EXPLORING FOR LATE FORMED OIL/GAS RESERVOIRS IN SOUTH CHINA

近 5 0年的油气勘探实践证明 :中国南方古生界的油气藏以晚期成藏最具工业价值。此一晚期成藏具有多期改造、破坏及重建的过程 ,多以后期改造和重建为主。后期改造主要包括重建封闭体系和油气相态的转化 ;重建的晚期油气藏则可能是不同成因、不同时期、不同类型油气在新的条件下重新聚集的结果 ,威远气田便是晚期成藏的典型代表。中国南方晚期油气成藏的决定因素是油气供给与构造的匹配关系 ,依此可划分出早生晚成型、晚生晚成型及重建型 3大类。目前 ,重建型的晚生油气藏应是中国南方古生界油气勘探取得突破的重要目标。

It was proved by the oil/gas exploration practice in the last fifty years that the late formed Paleozoic oil/gas reservoirs in South China have most commercial value These late formed reservoirs had undergone multiphase reformation,destruction and reconstruction and most of them were mainly the late reformation and reconstruction ones The late reformation includes the transferring from oil phase to gas phase;and the late oil/gas reservoirs reconstructed may be regarded as a result of the re accumulation of the oil and gas coming from different geneses,stages and types under the new conditions Obviously,Weiyuan gas field may be served as the typical example of the late firmed reservoirs The decisive factor of forming the late formed reservoirs in South China is the matching of the relations between the hydrocarbon sources and the structural conditions According to this, the late formed reservoirs may be divided into three types as early generation late formation reservoirs,late generation late formation resevoirs and reconstruction reservoirs The important target of making a breakthrough in exploring for oil and gas in the Paleozoic in South China should be the late formed reconstruction reservoirs at present