| Moliqing block is located in the manchu autonomous county of Siping city of Jilin province, the distance from its north to changchun is 60 kilometers, west to Gongzhuling city is 25 kilometers, east to Yitong is 18 kilometers. The boundaries of the east and the west of Moliqing oil field are low hills, the topography is relatively flat within the oil field, and the topographic relief is small, the zone covers an area of 71.5 km2, the regional structure is located in Yitong graben, southwest of Moliqing fault depression, spanning three second-order tectonic units, the structure are backer sag, Maanshan fault terrace zone from northwest to southeast.The superface structural form of purpose layer is the monoclinic of northeast tilt, fault develops in the cooperation zone, there develops 18 normal faults of different sizes.The development purpose layer is mainly the â…£, â…¤ sand group of double second segment.The sand body develops in subaqueous fan or fan delta front of rapid accumulation has poor reservoir delamination continuity,and it pinchouts fast and is not easy to track.The compositional maturity and textural maturity of Moliqing oil field are low,The lithic content is on the high side, the quartz content is low, and the sorting and roundness is low, the structure is complex, the reservoir heterogeneity is stronger in this area, and the physical condition controls the high yield and the enrichment of oil and gas, there exists natural fracture which is not very developed, the pore types of rocks in this area are intergranular pore and dissolution pore, and the reservoir is mainly oil, water, oil and water and dry layer, and there is not pure gas layer, the reservoir type is composite reservoir consists of the fault block reservoir, fault ~ lithologic reservoir,lithologic reservoir and various types.Comprehensively use core, logging, well logging, production test and the dynamic data of development,and combining previous research results and understanding, study the geological characteristics of structure, sedimentary, reservoir and fluid of Moliqing block, analyze the affecting factors of production capacity of horizontal wells, on the basis of geological characteristics,take the horizontal wells as the research object,summarize the production law of horizontal wells, study the change condition of production, and analyze the production decline factors of horizontal wells.Carry out the calculation parameters of reserves of horizontal well, analyze the calculation methods of controlled reserves of single horizontal well,such as trajectory control method, ellipsoid, drainage area and experience statistics method.Comprehensively analyze the applicable conditions and error size of each method,then optimum the reasonable method, and combining the dynamic production situation of Moliqing block,making calculation and reasonable evaluation of controlled reserves of single well. |
