Research On Gritty Reservoir In Upper Es4 Of Block Yong 920

The block Yong 920 locate in the northern part of Dongying depression, where widely develop series of gritty glutenite, especially glutinite in the Es3, Es4, all has a good exploration prospects. However, the glutenite generally develop more stage and many sedimentary complex, with its complicated internal structure and difficult development of oil and gas, so domestic and international still havn't systematic study and description for this type of oil and gas reservoirs. In this thesis, we fucus on the glutenite reservoir characteristics and described collocation feature of single period glutenite, evaluation high-quality reservoir, which have practical significance for improving th effectiveness of glutenite, meanwhile also has great theory significance for the development of glutenite reservoir sedimentology.According to core data, seismic data of profile characteristics and logging, oil layer in this area mainly subaqueous fan deposits, lithiligy in the vertical profile of glutenite changes cyclicity. Each cycle from the bottom to up turning slender: conglomerate– glutenite– pebbled sandstone– sandstone– mudstone, forming obvious three stage, first, blocklike conglomerate section: make up with thick layer conglomerate, accidentally clinch flag mudstone layer, fall into root fan subfacies; second, layered conglomerate segment: from the glutenite and mudstone, fall into central fan subfacies; third, mudstone with thin sandy conglomerate section, fall into fringe fan subfacies. Different layer favor the formation of different types of reservoirs.Based on the core observation and study of sedimentary facies we divided the glutenite of Es4 on the steep slope into four groups, and the fourth group did not cross. The development of three sand groups in the plane marked control by the development of ancient gully Yan 18, in the front of the ancient gully the thickness of glutenite very big and the south side thinner, the east and west sides thinning. Vertically, the sand body regressivly deposition and imbricated distribution. The second and third sand group was the major oil strata of area Yong 920, the thickness of the first group very thin and difficult to identify in the seismic section, the fourth group did not cross, only well Yong 920 drilled. The direction distribution of glutenite sandbody in second and third groups is from northeast to sourthwest. The largest sandbody of thickness is in the area of Yong 920.The region of interest is located in the northern part of Dongying depression, the reservoir is a nearshore submarine fan which dominated deposition glutenite and the main bodysand distirbution in the upper Es4, butial depth 2850-3650m. In generally constituted a half open halt closed reservoir, and thin down in the direction of rock fan until become a closed border, meantime to the root fan the particles become thicker or directly contacts with other border causing the connection of the edge or th bottom. Based on the reserch of inserting coil of available reservoir in area Yong 920, overall the reservoir lithology, distribution of sedimentary facies, properties, capillary pressure, image analysis, slices results and diagenesis we classified the glutenite reservoir of Es4 into three categories, typeⅠin this area is the best performance of the reservoir.