二连盆地地层岩性油藏“多元控砂—四元成藏—主元富集”与勘探实践(Ⅰ)——“多元控砂”机理

"Multi-factor controlling,four-factor entrapping and key-factor enrichment" of stratigraphic-lithologic reservoirs and exploration practice in Erlian Basin (Ⅰ)——"Multi-factor controlling" mechanism

二连盆地地层岩性油藏勘探取得了重大突破,在多个面积只有1000～2000km2的中小型断陷凹陷内发现了3000～5000万吨级的地层岩性油藏石油储量。勘探实践与地质研究表明,二连盆地具有"多元控砂—四元成藏—主元富集"地层岩性油藏形成、分布和富集的基本规律。

Exploration of 30-50 million tons of oil stratigraphic-lithologic reservoirs in Erlian Basin has made a significant breakthrough. reserves have been found from strati c-lithologic reservoirs in several middle-small fault sags with area of 1 000 to 2 000 km^2. According to the exploration and geologic research, it showed that the forming, distribution and enrichment of the stratigraphic-lithologic reservoirs are characterized by ＂Multi-factor controlling, four-factor entrapping and key-factor enrichment＂. The forming and distribution of sand body are controlled by the types of the structural belt, contemporaneous fault, system tract, slope break belt and sedimentary facies. The accumulation of the sand body traps is restricted by four factors, including hydrocarbon migration pathway, hydrodynamic force, critical physical property of reservoir and confining factor of sand bodies. The enrichment of the stratigraphic-lithologic reservoirs is controlled by three key factors, including abundant oil sources, high quality sand body traps and main confluent passageway.