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根据沉积层序、构造变形样式及地层接触关系,将黔南拗陷沉积盖层划分为3大构造层,并重新划分黔南拗陷的构造区划。通过野外地质调查并结合地球物理资料,按黔南拗陷断裂特征及其不同部位构造变形强度的差异,将黔南拗陷划分为叠瓦冲断变形区和褶皱冲断变形区。黔南拗陷具有东西分带、上下分层的特点。依据各构造单元变形强度等相关要素的评价,优选出长顺凹陷为相对稳定的油气保存区,结合该区的石油地质条件,指出长顺凹陷为下步油气勘探的有利区带。
According to sedimentary sequence, tectonic deformation pattern and strata contact, the sedimentary cover in Qiannan depression is divided into three major structural strata and the tectonic divisions of Qiannan depression are reclassified. According to the field geological survey and geophysical data, according to the fault features of Qiannan depression and the differences of tectonic deformation intensity in different parts, Qiannan depression is divided into superimposed thrust faults and fold thrust faults. Qiannan depression with east-west zoning, layered features. According to the evaluation of relevant elements such as deformation strength of each structural unit, the Changshu sag is preferred as a relatively stable oil and gas reservoir. According to the petroleum geological conditions in this area, the Changshun sag is indicated as a favorable zone for the next oil and gas exploration.