Conditions On Petroleum Pooling In Wendong Slope Belt

The Wendong slop zone is located in the east part of the central high belt inDongpu depression, is across Wennan oilfield and Qiaokou oilfield in thesouth part. Bordered by Xulou big fault in the west, and Qianliyuan sag in theeast, covers about 100 km2, which is the potential area to increase reservesand production, with simple inner construction and monocline extension whichintend to disappear in the southeast.The main proplems of exploration in the area includes: (1) The acc uracy ofthe seismic lithology reversion is influences by its deeply burying and thin sand;(2) It is difficult to predict the rule of sand lateral extension due to the diversityand variation of sedimentary system;(3) The correlation of oil and water in t hetarget zone is complex, without the uniform border of oil -warter, so it is veryimportant to make clear of the development rule of the reservoir distribution.Based on the material of the geology, seismic, logging, laboratory test andproduction test, the paper studied the high accuracy sequence structure,microfacies , favorable sedimentary facies belt, reservoir sandstonedevelopment , lithology or lithology-structure combine reservoir regulation andreservoir zone of the S2L-S3M formation in the Wendong slop zone, andconstruct the pooling model, and provide the favorable drilling and exploretargets of the lithology or lithology-structure combine reservoir.