四川盆地川西坳陷深盆气探讨

深盆气是致密砂岩气藏类型之一,由于其独特的成藏机制和气藏特征,对深盆气藏的勘探思路与对策均有别于常规气藏。川西坳陷陆相致密碎屑岩领域是否存在深盆气? 国内许多学者、专家各舒己见,提出了不同的认识。从成藏机制及气藏特征两方面将川西致密砂岩气和北美深盆气进行类比,认为川西上三叠统迄今为止尚未发现具有典型深盆气特征的气藏;就成藏机制而言,川西坳陷的天然气成藏机制与深盆气完全不同。川西上三叠统天然气的成藏属“早常规-晚改造”复式成藏模式。 

STUDY ON DEEP BASIN GAS IN THE WESTERN SICHUAN DEPRESSION, THE SICHUAN BASIN

Natural gas in deep basin reservoirs is one type of tight sandstone gas pools, and its exploration strategy is wholly different from normal reservoirs due to its special characteristics and mechanism of gas accumulation. Is there any deep basin gas in tight clastics of continental facies in the Western Sichuan Depression? There were much different arguments about that. The gas accumulation mechanism and gas reservoir characteristics in the Westem Sichuan Depression were compared with those of deep basin gas reservoirs in North American. It was considered that typical characteristics of deep basin gas had not been discovered in the Upper Triassic reservoirs. The gas accumulation mechanism of the Western Sichuan Depression is different from those of deep basin gas reservoirs. The complex gas accumulation model of "normal accumulotion in the early stage and modification in the late" was suggested.