Fine Reservoir Study Of H75 Block In North Of The Honggang Oilfield

This Study "Fine reservoir study of H75 block in north of the Honggang Oilfield" is to understand the characteristics of oil reservoir development and conduct the four character relationships between the reservoir, simulate the reservoir distribution, establish three-dimensional space model of Fuyu reservoir and Gaotaizi reservoir , providing the more in line with the actual geological model for remaining oil development, providing the geological basis for residual oil development in the north of Honggang oilfield in future.Through the core observation to determine the sedimentary microfacies types and the development law and characteristics of core in work area, provide a more realistic sequence of vertical development in order to determine the distribution of sedimentary micro-phase. Use the results of the of cores observation to determine the relationship standards between the rock and electricity, to establish the conversion model between rock and electricity. Explain sedimentary microfacies artificially for each layer or sand formation of each well,Establish vertical sedimentary microfacies model of each single well. And reached the following conclusions:1. Use stability mud strata as a sign of contrast, adopting the deposition cycles descending levels, grading the guiding ideology of contrast control.Make single layer dividing of Gaotaizi oil layer and Fuyu oillayer in studay area, under the control of sedimentary cycle and maker bed,Gaotaizi oil layer is divided into a total of 23 single-layer in two well field, Fuyu oil layer is divided into 25 single layer. Establish a single-stratigraphic framework basicly, to avoid the phenomenon of the sand body wearing layer and leakage of divided.2. The study shows that Gaotaizi and Fuyu reservoirs sediment is mainly affected by the West-northwest source control in this area, underwater distributary channel and distributary channel extends from west to east. Gaotaizi reservoir and F1a-F2b single-layer of Fuyu reservoir was the main delta front sedimentary microfacies, mainly develop underwater distributary channel, inter-branch Bay, the estuary bar, distal bar, delta front sheet sand, prodelta clay; F3a-12b single layer of Fuyu reservoir developed distributary channel mainly, the development of sedimentary microfacies main was distributary channel, interdistributory channel bay, crevasse splay and so on.3.The sedimentary microfacies of delta front sheet sand and mouthbar was dominant within the delta front subfacies in Work area, underwater distributary channel microfacies is located in the center delta front subfacies, main lithology is siltstone. in the size of There distribut Interdistributary bay of muddy sediment between the distribution of distributary channel . The estuary bar microfacies is located at the mouth of river region, in the process of pushing forward of the delta, distributary channel sandbodies can even cut into lake bay or predelta. at the side near to the lake in the river mouth bar,because of the dual influence of lake waves and river, some fine-grained material have been transported someplace further to deposite.forming distal bars around the outer edge of the river mouth bar. The distant delata sediments was transported by lake wave and deposited in flank of delta,form sand microfacies in work area.Fuyu reservoir was main distributary channel micorofacies in delta plain subfacies, most width of single sand body of the river shorter than 1000m, the banded distribution of distributary channel sandbody is the direct cause of the complex and changeable reservoir.4.Based on studying sedimentary microfacies and frame of layer comparison, we sum up the causes of the sand body and its types.5. Sand thicknes and sand scale distribution are controlled by the Sedimentary microfacies, in general, from the Fuyu and Gaotaizi oil layer ,(underwater) distributary channel sand thickness is 2-5 m generally; followed by the mouth bar, the thickness is about 3 meter. The distribution of reservoir properties is Obviously controlled by sedimentary microfacies. Generally, (underwater) distributary channel sandbody has better reservoir properties, followed by the mouth bar and crevasse splay sand bodies, so well and development program designs should fully consider the type of microfacies factor.