摘要
异常流体压力封存箱，是国际９０年代新提出的油气运移聚集理论，世界上大多数沉积盆地中的油气均与封存箱成藏有关。识别一个沉积盆地是否具备封存箱成藏条件，主要有３个标志：①纵向有封隔层存在；②有异常流体压力；③有大致水平的超压顶面。通过对四川盆地上三叠统地层压力的平面展布规律和纵向演化特征的研究认为，上三叠统具有典型的封存箱成藏特点：上部封隔层为中侏罗统厚层泥岩；下部封隔层为上三叠统底部页岩及中三叠统致密灰岩；上、下封隔层间为连续超压，超压顶面海拔平均为－１１５０ｍ。根据出露地层及地层压力分布特征，可将封存箱在平面上划分为箱内超高压区、箱缘超压区和箱外常压区等三个部分。其中紧邻上三叠统生烃中心的环形地带──箱缘超压区，是寻找上三叠统气藏和侏罗系次生气藏的有利地区；该区中的灌口－南山构造带、大兴鼻状构造带等是勘探的有利目标。
Through studying the plane expansion lows and vertical evolution characteristics of Upper Triassic stratigraphic pressure in Sichuan Basin, the Upper Triassic Series is considered having the typical mothballed box poolformed characteristics: The top mothballed stratum is thick shale of Middle Jurassic Series; The bottom one is the shale of Upper Triassic Series basement and the tight limestone of Middle Triassic Series; Continuous superpressure is between the top and the bottom, and the average buried depth of the superpressure top is -1150 m. In the light of the distribution characteristics of exposure strata and stratum pressures, the mothballed box can be horizontally divided into three parts of the superpressure district inside the box, the superpressure district on the box border and the normal pressure border inside the box. Among them, the circular zone (Superpressure district on the box border) near Upper Triassic hydrocarbon-generating centre is the favourable area for surveying the gas pools in Upper Triassic Series and Jurassic. Guankou-Nanshan structure and Daxing nose-like structure in the area are favourable explorative targets.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1994年第5期24-28,共5页
Natural Gas Industry
关键词
晚三叠世
天然气
气藏
油气聚集
Sichuan Basin
Later Triassic
fluid pressure
mothballed pressure
natural gas
pool-formed mode.
