Comprehensive Geologic Study Of Reserves Replacement Of Tiebiancheng Area In Jiyuan Oilfields

Jiyuan Oilfield TieBianCheng area located in Shaanxi Province Dingbian territory, located in the Central Ordos Basin, Northern slopes in the main structural position tectonic units, the overall area of approximately537square kilometers, chang2reservoir of Yanchang formation Upper Triassic as main oil reservoir area for the study group. This paper gives the details of stratigraphic division of the study area on combination of high-frequency sequence stratigraphic framework under the control of isochronous stratigraphic cycles contrast,"slice" comparison method, elevation comparison method. Found that chang21and chang22area have different degrees of loss in the northeast of study area. This paper researched Chang2reservoir sedimentary microfacies, combined with reservoir rock color characteristics, lithology, sedimentary structure characteristics and the study of signs and other logging facies of Chang2reservior.That the chang2reservior of TieBianCheng area can be divided into two groups, delta front facies and underwater distributary channel, split between the Bay microfacies. Northeasten is the main Provenance direction of study area. As the front delta underwater of mainly high distributary channel sand bodies deposited constructive framework as the main feature.Therefore, the development of sand body is mainly controled by distributary channel. After the study of Chang2reservoir sand body distribution characteristics of plane.That the study area is mainly developed a sand body to a shunt evolution with its four sand belts in NE-SW. On this foundation, as the basis of deposit micro-reservoir properties of sand control law, Combined reservoir classification and evaluation, Spatial distribution of reservoir, Physical relationship with Hydrocarbon。 Determine the Parameter and method of classification and evaluation of the reservoir,Having Studed and analyzed the impact factors of Chang2reservoir,such as palaeogeomorphology, migration pathways of oil and gas, reservoir traps, Eventually combined with the methods of old wells oiliness review and Formation fluid properties, having given Prediction of favorable areas in the study area,found that there are two favorable areasin chang211reservior of TieBianCheng area,four in chang212and three in chang213, Concentrated in the northeast edge deletion formation. Chang22and chang23each hauve three favorable areas,in the northeast of study area.The favorable areas in yuan214area are favorable areas.