Reservoir Characteristics And Geological Modeling Of Block Jiang 75 In Jiangqiao Area

Jiang 75 block is located in the Jiangqiao- Tailai nose structure belt in the western slope, and the faults is developed. The main oil-bearing layers are GI and SII+III formations.GI and Saertu formations are the research object,with the application of existing exploratory wells evaluation wells and development wells, carried out the stratigraphic cycle, sedimentary microfacies identification, applied analysis and laboratory test data to summarize reservoir characteristics and heterogeneity. On this basis, combining with the seismic interpretation and inversion results, established geological model, and put forward the favorable well aimed area.Jiang 75 block presents the trend of the west higher than the east under the background of the slope. With the application of cycle comparison method, GI is divided into 3 layers, and SII+III is subdivided into 11 layers,and built up the stratigraphic framework of Jiang 75 block.According to geological, logging and logging data, concluded that GI and Saertu formations mainly developed delta, shore shallow lake facies. The main types of reservoir sedimentary facies are delta front underwater distributary channel, mouth bar, distal bar and sand dam of shore-shallow lacustrine.The sandbody thickness of GI is higher than that of SII+III. The GI formation are almost water layers,the oil layers distributed only in GI1 layers in the Jiang 37 well area. The main oil-bearing formation is the upper part of SII+III. The oil-bearing sandstone type of underwater distributary channel and mouth bar. According to experiment results, the porosity and permeability of Saertu layers has good condition and strong heterogeneity. On the basis of stratigraphic correlation and the identification of sedimentary microfacies, combining with seismic data, using geological modeling software, established structure model, facies model and reservoir property model of GI and SII+III formations. According to the research results, proposed Jiang 77 well area is favorable well target area. Results improved the level of awareness of reservoir characteristics of the Jiang 75, grasped the sand body distribution, and put a solid geology foundation for expansion of the existing development block.