Study On Relationship Of The Characteristics Of Sedimentary Microfacies And Oil-bearing, Xinganling Oil Reservoir In Sudeerte Oilfield

The paper according to Xinganling Oil Reservoir Set in Sudeerte Oilfield of Hailaer basin,based on the analysis of the core, well drilling, logging curve, the article studies on the sequence, microfacies, and the relationship between the microfacies and oil-gas accumulation. Three related theories are needed during studying. They are high-resolution sequence stratigraphy, Physical characteristics of reservoir and oil-gas accumulation. There are five essential conclusions as follows.1. Based on the well drilling and logging records of 292 wells,the high-resolution sequence framework and the correspondence between sequence and oil reservoir set are builded up, and the objective interval is divided into 13 four-order sequences.2. By means of core and logging curve analyzing, the identification marks of lithologic-electric properties are established.sedimentary facies are recognized.The research area is devided into 6 oil reservoir sets.Bottom-to-top,They areâ…¤oil reservoir set,â…£oil reservoir set,â…¢oil reservoir set,â…¡oil reservoir set,â… oil reservoir set and zero oil reservoir set.â…¤oil reservoir set mainly developed underwater distributary channel microfacies of fan delta front facies, near-shore submarine fan and shallow-lake facies . At early stage of IV oil reservoir set mainly developed fan delta front facies and shallow lake Sedimentary Environment alternately, At later stage water deepened,sediment source withdrawed, shallow lake facies and fan delta front deposition were developed.At the sedimentation stage of III oil reservoir set,the supply of sediment source was sufficient,a typical prograded fan delta front formation was developed at the eastern area. At later stage of III oil reservoir set water deepened, the supply of sediment source reduced, the whole area mainly developed shallow lake facies.water was stable,At early sedimentation stage of II oil reservoir set, the supply of sediment source was sufficient,the formation showed some Characteristics of progradation. At later stage of II oil reservoir set, shallow lake Sedimentary Environment was mainly developed. the main microfacies were sand bars, sandy-muddy mixing beaches and mud flats.At later stage of I oil reservoir set water deepened, the whole area formed the characteristic of semi-deep lake, shallow lake, fan and delta front facies sedimentary combination.3. According to the single-well and the peofile of connecting-well,combined with the distributional planar graph of sand content and regional geological,we can make clear the evolution rules at three-dimensional. It is confirmed that there are many provenances at the area, the main Sedimentary Environment is fan delta front sedimentation. The main reservoir type is under water distributary channels sand and shore-shallow lacustrine sand bars.4. To some extent, the vertical feature of microfacies and the sequence cycles correlate. It is found out that the underwater interdistributory bays, under water distributary channel overspill, the sandy-muddy mixing beaches, mud flats, and deep lacustrine mud concentrate close to the flooding surfaces.While the accumulation zones of delta front under water distributary channels, river mouth bars, sand sheets, and shore-shallow lacustrine sand bars are in the neighborhood of sequence transform boundaries.5. The microfacies control distribution of the oil and water.the main oil reservoir centralizes on the under water distributary channels and beach bar.the oil-containing sand was showed banding under the control of the sedimentary microfacies,and the oil reservoir spreading direction is the same as the Sediment Provenance at Planar Graph.