Analysis On He 8 Reservoir Conformational And Its Three-dimensional Geologic Modeling In SDXX Close Well Spacings Area Of Sulige Gas Field

The SDXX close spacings area of Sulige Gas Field in the Erdos Basin is located on a west slope monoclinic structure in the central and northern slope of the Yishan slope.Although the subsurface reservoir sandstone is very developed,the effective sandstone is not very developed,and the effective sandstone in distribution area,thickness and connectivity are not yet clear;In addition,the well network of the study area is relatively dilute.Although well network encryption is performed in the encryption area,whether the well network of 500m×650m is suitable for further study in the eastern area of the Sulige gas field.In response to these problems,this paper firstly conducts stratigraphic division and comparison of strata of wells in the study area,establishes fine stratigraphic divisions and unified comparisons based on sedimentary cycles,and then determines sedimentary facies-microfacies types in the study area and establishes well logging phases.The analyzes the configuration of different sedimentary microfacies reservoirs for further,focuses on the internal configuration of point dams and banks,and establishes a three-dimensional model of the entire structure,sedimentary facies,and properties,finally,determines the effective sand body size in order to clear that the well network of 500 m ×650m is adaptable in the eastern part of the Sulige gas field.Mainly through the subdivision of the target area of the study area from the original four sub-layers into 10 deposition time units,and then using the entire region's feature interface,marking layer and the establishment of a closed skeleton profile to achieve the single-phase river cycle layer division and comparison in the whole region;Through the core observation and sedimentary background analysis of the two cored wells SDJ4-5 and wells SDJ3-6,determined that the target layer of the SDXX close well spacings area is a fluvial deposit and further developed for two sub-facies: meandering river and braided river,and these two sub-facies are further divided into 21 types of sedimentary microfacies,and establish the corresponding well-logging phase-microfacies model,therefore realize the sedimentary microfacies fine dissection of 139 wells in the whole region;Then,further analyze the reservoir configuration of different sedimentary microfacies,study the dip angle,interlayer density,interlayer extension length,and establish the development pattern of point dam configuration.The dips,scales of the internal layers of the riverbank,and the distribution locations of effective sandstones in the heart bank were analyzed.The length and width and boundaries of individual heart bank were determined.A three-dimensional geological model was established for the study area.According to these studies,identify and count the effective length and width of sandstone,formation pressure and combined with the adjacent infill wells have been put into the wells recovery analysis to determine a reasonable well pattern,it has laid a solid foundation for the improvement of the recovery of Sulige gas field and the increase of development benefits.