从油气地质条件看兴仁堡凹陷的勘探方向

Exploration direction of Xingrenpu depression from the view of petroleum geology condition

兴仁堡凹陷位于宁夏回族自治区南部,属于六盘山盆地的次级凹陷,面积约1200 km^2,处于早期勘探评价阶段.为了打开该区勘探新局面,在前人认识的基础上,以深化地质认识为前提,近两年新增地震部署、露头取芯和建场剖面;利用新、老资料对凹陷内构造、沉积、储盖、烃源岩等地质条件进一步研究,认为凹陷在多期构造活动的作用下,形成三组二级构造把凹陷分割成四个不同的构造单元,其中东、西部为挤压逆冲构造带,南部为正向断裂带,中部为负向洼陷带.区内中生界地层以河流相、湖相沉积为主,储盖组合较好;三叠系、侏罗系为两套较为有利的烃源岩,综合评价该区具有雄厚的资源基础和广阔的勘探前景,并指出原生油气藏和次生油气藏是该区的主要勘探方向,研究成果对该区下步的钻探具有现实指导意义.

The Xingrenpu depression is located in the southern part of Ningxia Hui Autonomous Region,belongs to the secondary sag of Liupanshan basin,the area of about 1200 km2,is in the early exploration and evaluation stage.In order to open up the new situation of exploration in this area,on the basis of the previous understanding,on the premise of deepening geological understanding,new seismic deployment,outcrop core and site profile have been added in the past two years,and the geological conditions such as structure,deposition,wenbei and source rocks in SAG have been further studied by using new and old data,and it is considered Three sets of two-stage tectonic units were formed to divide the sag into four different tectonic units,of which the east and west were extruded thrust tectonic belts,the southern part was positive fault zone and the middle was negative depression zone.The Mesozoic strata in the area are mainly river facies and lake Facies deposition,and the storage cover combination is good,and the Triassic and Jurassic are two sets of more favorable hydrocarbon source rocks.The comprehensive evaluation of this area has a strong resource base and broad exploration prospects,and points out that primary oil and gas reservoirs and secondary oil and gas reservoirs are the main exploration directions in this area.The research results have practical guiding significance for the next step drilling in this area.