Study Of Fine Stratigraphic Correlation And Sedimentary Of S4 Formation In Huan 95 Area, Huanxiling Oilfield

This paper carried out fine stratigraphic correlation and sedimentary facies analysis of S4 low permeability and porosity formation in Huan 95 area, Huanxiling oilfield with a low development degree, and summarized subdivision of sedimentary in internal S4 formation and the regularity of sand distribution, moreover pointed out the distribution scale of dark mudstone in special lithologic segment, and evaluated the distribution and potential of oil and gas resources of S4 formation in Huan 95 area. These results provides the basic reference for effective development of this block in the future.In order to solve the problem of stratigraphic correlation and sedimentary facies, this we carried out the study on the S4 formation of Huan 95 area through standardization technology of geophysical logging, sedimentary facies analysis technology and comprehensive technology combining geological and geological datai based on the theory of sequence stratigraphy and some new geophysics technology, This paper suggests that S4 formation is mainly fan delta deposition, with the lake surface increasing gradually from the bottom to the upper, there mainly developed (underwater) distributary channel, mouth bar, interdistributary, overbank sand, sheet sand, turbidite sand and other 7 kinds of sedimentary micro facies. The provenance of sedimentary rock is mainly from the northwest. For the Dujiatai formation river of S4 changed regularly, firstly decreased and then increased, and then to the special lithologic section of deep lake semi deep lake facies, the lake level up-down-up regular changed.Based on the analysis of 3 special parameters:Ro and TOC and effective thickness of hydrocarbon source rock in special lithologic segment, this paper found that the Ro was generally between 0.4-0.7%, the TOC value was relatively large, generally more than 3%, and organic matter abundance of hydrocarbon source rock in the study area is very good.Through Comprehensive analysis of multiple factors such as sedimentary structure, abundance of organic matter, effective thickness of dark mudstone,14 potential traps are identified.