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长岭断陷东部火山岩气藏具有储量规模大、丰度高、气层厚度大、储集物性好、单井产量高的特点,是深层天然气勘探的重点领域。通过对该区火山岩气藏成藏要素研究,认为下白垩统沙河子组湖—沼相暗色泥岩和煤系地层为主力烃源岩;营城组上部中—酸性火山喷发岩为主要储集层,储集空间以次生孔隙和裂缝为主;断裂和不整合面是油气运移的主要通道。根据长岭断陷火山岩气藏成藏特征,总结出3种成藏模式,即构造成藏模式、构造—岩性成藏模式和火山岩岩性成藏模式,其中构造—岩性复合型成藏模式为研究区最主要成藏类型。
The volcanic gas reservoirs in the east of Changling Fault Depression are characterized by large reserves, high abundance, large thickness of gas reservoirs, good reservoir properties and high single-well productivity, which are the key areas for deep natural gas exploration. Based on the study of the forming elements of volcanic gas reservoirs in this area, it is considered that the lower Cretaceous Shahezi Formation lake-marsh-facies dark mudstone and coal series strata are the main hydrocarbon source rocks and the middle-acidic volcanic eruption rocks in Yingcheng Formation are the major reservoirs The reservoir space is dominated by secondary pores and fractures. Faults and unconformities are the main channels for hydrocarbon migration. According to the reservoir forming characteristics of the volcanic gas reservoirs in the Changling fault depression, three types of reservoir forming patterns are summarized: reservoir-forming model, structural-lithologic reservoir model and volcanic lithologic reservoir forming model, in which tectono-lithologic composite reservoir The model is the most important type of reservoir formation in the study area.