基于实钻测井资料研究剩余油分布的新方法

New method of remaining oil distribution study based on actual drilling logging data

曹鹏 蒲万芬 邹伟宏 戴传瑞 常少英

CAO Peng PU Wanfen ZOU Weihong DAI Chuanrui CHANG Shaoying

中国石油杭州地质研究院，浙江杭州　310023 油气藏地质与开发工程国家重点实验室西南石油大学，四川成都　610500

Petrochina Hangzhou Research Institute of Geology, Hangzhou 310023, China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

针对陆梁油田陆9井区白垩系呼图壁河组XX油藏这一特殊的低幅度、薄层、高渗透底水油藏类型，自2001年大规模投入开发以来，目前采出程度仅为14%，综合含水72%左右，进入中高含水开采阶段，研究剩余油分布势在必行。提出了利用近年穿层井实钻测井资料研究剩余油分布的新方法，在充分利用油藏近5年开发井实钻测井资料的基础上，结合底水油藏水驱油机理研究油藏剩余油分布。结果表明，对于300 m×300 m的开发井网，在距离油井100~170 m的范围内油层波及程度仅为20%左右，即剩余油主要分布在开发井之间的油层顶部，且呈“船底型”分布。

The XX reservoir in Hutubihe formation Cretaceous in Area LU9 Luliang oilfield is a typical low-amplitude and thin-layered sandstone reservoir with high-permeability and bottom-water. Since the large-scale development in 2001, the recovery percent at present was only about 14% while general water cut was up to 72%, which means that the reservoir has entered into the late stage of water-flooding, so study the remaining oil distribution is imperative for this area. A new method of analyzing the remaining oil with actual drilling logging data of nearly drilled well was established in this paper. Making full use of these logging data for all development well during the past five years, combining with the theory of water flooding in bottom water reservoirs, distribution of remaining oil in thin-layered bottom-water reservoir was studied practically and reliably. It turned out that for the 300 m×300 m well pattern, the sweep degree is only 20% in the 100 m~170 m range away from production wells. In other word, the remaining oil is mainly laid on top of layers between production wells with ship-bottom shape.