渤南油田9砂层组高分辨率层序特征及其沉积演化

渤南油田下第三系沙河街组沙三段 9砂层组的浊流—湖泊沉积由 2个四级层序和 1 4个五级层序组成。每个四级层序的形成是碎屑物质供应由充分、中等到匮乏和湖平面由快速下降、缓慢下降、缓慢上升到快速上升共同作用的结果 ,其中碎屑供应中等与湖平面较为稳定相配合最有利于孔渗性好的砂岩储层的形成。经综合研究后认为 ,四级层序 、 的孔渗性好的储层在研究区的东南部、南部较发育

RESERVOIR CHARACTERISTICS OF HIGH-RESOLUTION SEQUENCE AND SEDIMENTARY EVOLUTION OF 9th SANDBODY GROUP IN THE BONAN OILFIELD

The ninth sandbody group of the third section of the Shahejieformation of Paleogene system in the Bonan Oilfield could be divided into two fourth-order sequences and fourteen fifth-order sequences. The clastic supply from abundance, moderate to deficiency and the lacustrine change from quickly falling, slowly falling, slowly rising to quickly rising contribute to the development of each fourth-order sequence. The combination of moderate clastic supply and steady lacustrine level change is the best opportunity for the porous permeable sandstone reservoir to be deposited. As a result, we conclude that the favorable reservoir sandbodies of sequence Ⅰ and sequence Ⅱ should be in the southeast and the south of the study area respectively.