Study On The Main Controlling Factors Of Tight Oil Of Gaotaizi Reservoir In Gulong Sag

In recent years through exploration and resource evaluation Gaotaizi reservoir in Gulong area, confirmed the three group and the four group contains a high dense oil is rich in resources, has a good exploration prospect, but the understanding of Gaotaizi dense oil reservoir characteristics and hydrocarbon accumulation is insufficient, and Research on the main controlling factors of hydrocarbon accumulation of lack of system constraints the oil and gas exploration and development, aiming at this situation, this paper based on the theory of petroleum geology, organic geochemistry and petrology, geochemistry, the logging and oil test data, and combined with the analysis of core observation, thin section, the study area of Gaotaizi reservoir accumulation conditions and reservoir characteristics were analyzed and summarized. Summarized the main control factors of reservoir.In the study area is located in northern Songliao Basin students hydrocarbon generation center and dark mudstone, green secondary and tertiary period of its development of hydrocarbon source rocks and green a hydrocarbon source rock for oil and gas into reservoir provide rich material basis, Qingshankou Formation source rock organic matter abundance high, belongs to the mature source rocks, deep reached hydrocarbon generation threshold, to provide protection for oil and gas accumulation and distribution of hydrocarbon source rock and the thickness control the oil reservoir. Insert three reservoir group, four reservoir is mainly delta front and shore shallow lake facies deposition, and hydrocarbon source rocks in direct contact or a finger, the source reservoir relationship well matched, sand body plane stable distribution, vertical mutual superposition, sand body distribution control reservoir distribution, lithology and siltstone and fine sandstone diagenesis is strong is mainly intergranular corrosion, particle dissolution pores and micro cracks, the average porosity is8.49%, and the average air permeability is 0.49×10-3μm2, reservoir in dense and ultra low permeability, porosity and super low pore, is a compact reservoir, determines the reservoir of rich oil. Dense oil is mainly distributed in the center of the sag and its slope and terrace site,basically do not see structural traps, contiguous distribution on the plane and direction of each layer were distributed, the monolayer thickness of thin, multi fractured oil and low natural deliverability, no uniform oil-water interface with the bottom edge of the water.