墨西哥Sureste盆地Salina次盆石油地质特征与勘探方向

墨西哥Sureste盆地是世界级富油气盆地,Salina次盆深水区勘探程度低,相关研究少。基于最新地震地质综合解释结果,并结合区域构造演化和沉积充填特征,论述了该区的石油地质特征与勘探方向。研究表明: Salina次盆构造演化复杂,盐岩活动强烈,控制了烃源岩、沉积储层、构造圈闭、油气运聚和保存等成藏要素。烃源岩为盆地内广泛发育的提塘阶海相页岩,在盐岩发育区具有微盆控烃的特点; 主要勘探目的层系为新近系碎屑岩,沉积与盐构造关系复杂,中新统砂岩储层较发育,物性较好; 次盆在平面上可划分为5个构造单元,主要发育与盐岩相关的背斜、半背斜等类型的圈闭; 盐刺穿褶皱带和盐蓬带成藏条件较好,是最有利的勘探区。

Petroleum geology and exploration prospect in Salina Sub-basin of Sureste Basin in Mexico

Sureste basin in Mexico is a world-class rich oil and gas basin, and the deep-water area of Salina Sub-basin is in low- degree exploration with less research. Based on the latest seismic geological comprehensive interpretation achievements and combining with regional tectonic evolution and sedimentary filling characteristics, the authors in this paper have discussed the petroleum geology and exploration direction in this area. The results show that the structure evolution of Salina Sub-basin is complicated, and the activities in halite is intense, which controls the hydrocarbon accumulation elements of source, sedimentary, structure, migration and preservation. The source rock is Tithonian marine shale, which is widely developed in the basin and has characteristic of micro-basin controlled hydrocarbon in the salt development zones. The main exploration target is Tertiary clastics, and the relationship between deposition and salt structure is complex. The Miocene sandstone is developed with good porosity and permeability properties. And the sub-basin can be divided into five tectonic units, and the main types of trap are salt-related anticline and semi-anticline. The salt-thrust-belt and the salt-canopy-belt are favorable exploration area with good hydrocarbon accumulation conditions.