| Li151 reservoir is located in the southwest part of Shanbei slope in Ordos Basin, oil fields are located in areas from top to bottom in turn was drilled in the Quaternary and Cretaceous (Huanhe, Huachi and Luo Yijun formation), Jurassic (Anding, Zhiluo, Yan'an and Fuxian formation), Triassic Yanchang formation. Li151 reservoir is still in the early stage of development, Mesozoic Jurassic Yan 8-Yan10 of Yanan formation is mainoil layer, which is 130m thick.There are some problems below when developing:strata development layer system is mutiple, stratigraphic architecture is coarse. To meet at late stage of oilfield development, small scale stratigraphic unit needs, the high resolution sequence stratigraphic framework is to establish. formation micro structure and its influence on production is lack of knowledge. There is not a clear understanding of sedimentary microfacies and sand body distribution. reservoir geological features is shortage of knowledge. what's more there is lack of suitable development of technology policy for the geological characteristics of the area. Because in recent years Jurassic reservoir built production scale is small, the layer series of development, to explore this kind of reservoir fine description method, the formation of new productive reservoir, development model, to ensure oilfield development is very important.Based on the mark layer, lithologic association and sedimentary cycle,under the control of, according to the hierarchical control, cycle comparison method, the region's consistent stratigraphic sequence framework is established, the Yan 8-Yan 10 of Yanan formation is divided into 12 small layers. The analysis shows that the oil reservoir mainly distribut in the (y8-1> y10-1> y9-2> y8-3> y9-1> y8-2) 6 small layers, which is the focus of the late development. Two structural characteristics analysis showed that: Li151 reservoir is a NE-SW-. The control of structure on the production capacity is obvious.From the high partof the structure to the the lower part of the structure, then slope,the oil well production capacity gradually decreased, the production of water increased gradually.Based on lithology and well logging data,reservoir sedimentary microfacies is studied. Yan 8-Yan9 of Yanan formation is delta plain subfacies, Yan10 is braided river facies. Among them: delta delta plain channel sand dam, shunt channel and braided river beach is the most favorable 3 kinds of sedimentary microfacies, oil production capacity from stong to weak is the channel sandbars, points stream,distributary channels.Yan 8-Yan9 of Yanan formation ?? layer distributs in the middle of the river, to the channel side edge reservoir level gradually decreases. Yan10 is mainly type ?, and the test data showed that the production level was mainly type ?-?, and the better the quality of the reservoir, the stronger the production ability.Based on volume method, probability method and modeling method.reserves is calculated.the li 151 area of the petroleum geological reserves is 290.2×104t Among them, Y8-1 accounted for 38.4% of reserves, Y10-1 accounted for 34% of reserves, which is the focus of the next step development.Prodution data is history matched, reservoir engineering is analysised. Better development effect in the whole reservoir li 151 Yan 8 oil group, but the pressure to maintain the low level of suggestions for water. The simulation results show that the reasonable injection production well spacing for inverted nine spot well network and converting time for 3 years within, water injection intensity fluid producing intensity was 1.3. |
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