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LH-A油田为南海东部珠江口盆地深水新区油田,其所在海域水深400m。开发评价初期,油田钻井少(2口),储层非均质性强,纵向发育有灰岩、灰质砂岩、砂岩等多种岩性储层,同时还交互分布有多层低阻油层,两口井钻遇的储层差异性大,地质特征复杂,储层预测成为本阶段研究难点。通过岩心、铸体薄片等资料分析,利用硬石膏、褐铁矿等胶结物对沉积环境的指示作用完成油田地层划分,解决了储层横向预测的瓶颈问题;同时采用地质统计学反演方法,综合测井、地质、地球物理等资料对储层进行空间预测和描述,特别是薄泥岩夹层的精细刻画。研究表明,LH-A油田ZJ30油藏为块状底水油藏,两口井钻遇的泥岩夹层不连片发育;低阻油层虽呈层状连片分布,但物性较好,不影响油田开发;采用“低平高直中斜”3种井型结合开采ZJ30油藏,预测出了较好的开发效果。
The LH-A oilfield is the Sham Shui New Area oilfield in the Pearl River Mouth Basin in the east of the South China Sea. Its water depth is 400m. In the early stage of development and evaluation, there were few oil wells (2 wells), strong reservoir heterogeneity, and a variety of lithologic reservoirs such as limestone, limestone sandstone and sandstone were longitudinally developed. At the same time, multi-layer low resistivity reservoirs were interactively distributed. Well encountered drilling reservoirs with large differences in geological features, reservoir prediction has become the study of this stage difficulties. Based on the analysis of the data of cores and castings, the stratigraphic division of the oilfield is completed by using the indication of sedimentary environment such as anhydrite and limonite, which solves the bottleneck problem of lateral reservoir prediction. At the same time, by means of geostatistical inversion, Comprehensive logging, geology, geophysics and other data to the spatial prediction and description of the reservoir, especially thin sandstone interlayer fine depiction. The results show that the ZJ30 reservoir in LH-A oilfield is a block bottom water reservoir, and the mudstone intercalations developed between the two wells are not contiguous with each other. Although the low-resistivity reservoirs are layered and contiguous, they have better physical properties and do not affect the development of oil fields The ZJ30 reservoir was mined by using three kinds of wellbores with “low level, high level and medium slope”, and the better development effect was predicted.