Abstract: A comprehensive study with abundant data demonatrates that the main factor affecting the accumulation of natural gas in Wolonghe gas field is a favorable combination of cap-sourcereservoir rocks. The gas in Triassic reservoirs is originated from Triassic Formations and same manner occurs in permian reservoir, while the gas in Carboniferous reservoirs is come from other formations. In addition to the abundant gypcum, clay and shale tight carbonate rocks also play a role in the capping of the natural gas. Multiple pay zones (as many as 18 zones) are resulted from the development of fracture systems, which is not limited by the anticlinical structure and the accumulation of natural gas is governed by the presence of fractures rather than either the structural position or lithologic characteristics. Thus a much wider area outside the anticlinical structure will be taken as a target at exploration. The pressure coefficient differs for different reservoirs and for different parts in the gas field due to mainly the poor lateral continuity of the reservoir beds. The key to the accumulation of natural gas is the presence of the Tc⁵, Triassic Jialing river Formation and the Carboniferous Formations with well developed secondary porosity which had been reformed by fracturing to form a intercommunicated reservoir. Thus it is highly successful in exploration and a highly prolific gas field with a large amount of gas reserve is discovered.

摘要： 综合大量资料研究认为,卧龙河气田天然气富集的因素,主要在于有较好的生储盖层及其组合。卧龙河气田三叠系以自生自储为主,二叠系为自生自储,石炭系为他源。盖层除有大量石膏岩和泥页岩外,致密碳酸盐岩也是较好的隔盖层;产层多(18个),是裂缝导致的结果,但裂缝却不受背斜圈闭限制,油气也不择岩性而聚集,只要有裂缝便可能有油气,其勘探领域远比背斜圈闭宽广;地层压力系数高低参差,主要是由于储层连通性不好所致。卧龙河富集气的关键,在于具有石炭系和三叠系嘉陵江组T_c⁵₁两个次生孔隙较发育的、经裂缝改造后使全层基本连通的储层,故勘探成功率高,储产量大。