Abstract: Linbei area was located in the middle of the central uplift zone of Huimin depression. Aiming at the problems of unclear reservoir type, trap scale and reservoir validity of the Jishan sand body in this area, starting from hydrocarbon source conditions, reservoir physical properties, distribution of sedimentary facies and structural features, through the data of drilling and oil testing results, comprehensive application of geological, geochemical analysis and geophysical research means, in depth analysis of hydrocarbon accumulation conditions and main control factors. The results show that: the high⁃quality source rock in the third member of Shahejie formation is the main source of Linbeijishan sand body, and the good configuration of sand bodies in different periods in time and space is the basis for the formation of hydrocarbon accumulation; the relationships between the developed faults and the pathway system of framework sand body in the area provides a good migration channel for oil and gas, which results in the zonal distribution of oil and gas reservoirs along the North⁃South fault steps; The mudstone in the upper part of the third member of Shahejie formation and the thick mudstone at the top of the Jishan sand body are stable, The sand body of each stage are separated by mudstone and pinched out from the east to the west, the high salinity primary CaCl2 water type with good sealing property developed in the third member of Shahejie formation and the lateral sealing of some faults act together to provided good preservation conditions for oil and gas reservoirs.

Key words: Huimin depression, The Jishan sand body in Linbei area, Oil and gas accumulation, The main controlling factors, Pathway system

摘要： 临北地区位于惠民凹陷中央隆起带中部，针对该区沙三中亚段基山砂体的储层类型、圈闭规模及储层有效性不清等问题，从烃源条件、储层物性、沉积相展布以及构造特征等方面入手，通过钻井和试油成果资料，综合应用地质、地化分析和地球物理研究手段，剖析了油气成藏条件及主控因素。结果表明，紧邻的临南洼陷沙三段优质烃源岩是临北基山砂体的主要来源，和区内各期砂体在时空上的良好配置是油气藏形成的基础；区内发育的断裂和骨架砂体输导体系之间的相互配置关系，为油气提供良好的运移通道，使油气藏沿南北向成断阶式带状分布；沙三上亚段的泥岩及基山砂体顶部稳定的厚层泥岩、各期次砂体之间被泥岩分隔，且东西向上倾尖灭、沙三段发育封闭性较好的高矿化度原生CaCl2水型，同时部分断层侧向封堵，这些因素的共同作用为油气藏提供良好的保存条件。

关键词: 惠民凹陷, 临北基山砂体, 油气成藏, 主控因素, 输导体系