Research On Petroleum Geologic Of Aer Sag In Erlian Basin

ErLian is a faulted basin which developed on the base of Hercynian geosyncline fold in Mesozoic Era,which consists of several dispersed small faulted basins. The overall resources is in large scale, but resources dispersion, depression between resourses is great disparity difference, not every depression has accumulation conditions. Aer sag is on the northeast of ErLian Basin,though the area is not large,the quantity of source rock is better,great thickness,rich in oil and gas.The unique tectonic evolution history, A regional unconformity formed in the middle of the hydrocarbon source rock of Tang Yi period, is the main channel of oil and gas lateral migration; Form a whole sag anticline belt between the steep belt and depression, is the main accumulation direction of oil and gas. During the sedimentary period of TengYi, steep belt source develops, forms several fan deltas along the long axis direction, scattered distributes along the fault laterally, front sandbodies of fan delta are favorable reservoir.Combine with controlling factors of hydrocarbon accumulation of oil and gas,aim at two types of reservoir, clastic rock and QianShan, construct many types of accumulation conditions model implementation and drilling guide traps, have achieved good exploration results.This article makes a comprehensive reaearch on stratigraphic sequence、sag tectonic evolution sedimentary system and hydrocarbon accumulation conditions and petroleum geological conditions, clears and definites the main controlling factors of each layer reservoir forming, summarizes the accumulation rules of oil and gas, sums up the depression in structure、deposition and unique features, points out the most representative characteristics of tectonic inversion、steep zone of sedimentary system development and synsedimentary anticline in ErLian Basin, understands the characteristics of petroleum geology of ErLian Basin.