大庆外围盆地勘探潜力

Analysis of Exploration Potential in Surrounding Basins of Daqing Oilfield

大庆外围盆地存在多套烃源岩层和多种类型的储层,各盆地区域构造条件不同,盆地的沉积盖层和成藏条件也不同。从烃源岩厚度、地球化学特征、储层特征、油气资源量等几方面入手,对三江盆地绥滨坳陷、依—舒地堑汤原断陷和方正断陷、漠河盆地、大杨树盆地等外围重点盆地的勘探潜力进行了分析,预测了各盆地的有利含油气区带,研究确定了外围盆地主要四套勘探层系,其中主要发育于大杨树、汤原、三江的下白垩统第二勘探层系和发育于汤原、方正断陷的第三系第四勘探层系是目前主攻重点。由此确定了三江盆地绥滨坳陷和依—舒地堑为战略突破盆地,漠河盆地和大杨树盆地为战略展开盆地。

A number of sets of hydrocarbon source rock and multi-type reservoirs exist in the surrounding basins of Daqing Oil?eld. The sedimentary cap rock and the conditions for hydrocarbon migration and accumulation are different owing to the different regional structural conditions of various basins. Based on the thickness of source rock, geochemical characteristics, reservoir characteristics and oil and gas reserves, the analysis is made on exploration potential in the key surrounding basins, such as Suibing Depression of Sanjiang Basin, Tangyuan Fault Depression and Fangzheng Fault Depression of Yi-Shu Graben, Mohe Basin, and Dayangshu Basin. The prediction is made on the favorable oil and gas zones of each basin and four main sets of formation series are located for exploration of the surrounding basins. Of those, the second formation series of Lower Cretaceous developed in Dayangshu, Tangyuan and Sanjiang as well as the fourth formation series of Tertiary developed in Tangyuan and Fangzheng are determined as the main targets for exploration. Therefore, Suibing Depression of Sanjiang Basin and Yi-Shu Graben are determined as the basins for strategic breakthroughs and Mohe Basin and Dayangshu Basin as the basins for strategic extension.