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《Acta Sedimentologica Sinica》 2005-04
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Application of Sequence Stratigraphy to Improving Mature Oil Field Recovery

YIN Tai-ju1 ZHANG Chang-min1 LI Zhong-chao2MAO Li-hua2 DENG Hong-wen31(Yangtze University , Jingzhou Hubei 434023) 2(Zhongyuan Oil Field Company Ltd, SINOPEC, Puyang Henan 457001) 3(China University of Geoscience, Beijing 100083 )  
Pucheng oil field is located in the Dongpu depress, Henan province. Four scales of sequence cycles are distinguished in study area, including very short term cycle, short term one, medium term one and long term cycle. The heterogeneities study indicates that base level controlled sand distribution and the reservoir heterogeneities. In the rising semi-cycle of short cycle , the property are better at the bottom of the sands and becoming poorer to top, while with a totally different way in the falling semi-cycle. At the lower position of medium and long term cycles, braided channel are well developed with a widespread area and good property, while at the high position of the cycles, the braided channel are small and the sand spread area are limited with poor property. In the rising semi-cycle of long-and medium-cycles, the reservoir become poorer from bottom to top, while it becomes better in the falling semi-cycle. From the bank to lacustrine center, the braided channel becomes weaker and smaller, and the reservoir architecture turns to be mainly of sheet-like sands near the front of middle fan from mainly of channel sands near the middle fan, and finally of lacustrine mud at the lake center. The distribution of OOIP(original oil in place) and the residual oil are also controlled by the baselevel framework. OOIP is high at the low baselevel place in the framework, and high while the baselevel is at the high place. Sandbody at the low baselevel place is always with good property and easy to be diploid, so it is often placed on the important place in the development, and with large output. But with high OOIP, its remaining amount is always in large quantities. Sandbody at the high baselevel is always with poor property and difficult to deploid, and be put in the secondary place in the development, so its output is little. But with low OOIP, its ratio of remaining oil in the reservoir is not important.
【Fund】: 中国石油化工股份公司“十五”重点项目“深层低渗油藏难动用储量开发配套技术”(P01033)部分研究成果;; “973”项目(2001CB209106)资助。
【CateGory Index】: P618.13;P539.2
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