Research On Reservoir Characteristics Of The Second Part Of The Third Member Of Shahejie Formation In Shen 161 Block

Based on relevant research results of adjacent blocks and the previous reseachers,according to amounts of data, such as 3D seismic,mud logging, well curves and core analysis,main research results are obtained on sequence famework, sedimentary characteristics,reservoir characteristics, oil-gas distribution about Shen 161 block.by means of the principle and method of the high-resolution sequence stratigraphy, according to detailed analysis on core and well curves and by the study of division and correlation of substrata in Shen 161 block, it was divided into 4 oil layer groups, 26 sandstone layer groups,59 sub-layers.Study on sedimentary characteristics shows that Shen 161 block is dominated by braided river-delta,which is mainly the front channel, subface including 4 kinds of microfacies, such as subaqueous distributary channel microfacies, front sheet sand microfacies, interchannel shale microfacies and interchannel thin-layer sandstone microfacies. The lithology of reservoir is chiefly fine sandstones, siltstone and sand-mud interbed. Graded bedding, current bedding and horizontal bedding were discovered. Study on reservoir characteristics shows that the reservoir belongs to the middle porosity-low permeability reservoir. Vertically, along with buried depth increasing the porosity and permeability will decrease; horizontally,porosity,permeability, clay content and oil saturation are all in control of sedimentary facies belt. Study on oil-gas distribution shows that research block is in control of both structure and sandbody, oil/gas is located at tectonic high position of each faulted block, there are multiple oil-water systems, and both structural oil-gas pool and structural-lithological oil-gas pool are developed, especially a majority in fault-lithological oil-gas pool.