埕海油田馆陶组水平井随钻曲线物性反演研究

doi:10.3969/j.issn.1672-9803.2021.01.010

摘要/Abstract

摘要： 大港滩海地区埕海油田馆陶组为底水稠油油藏,采用水平井开发,其测井系列全部为随钻测井,电测曲线仅有自然伽马和电阻率,缺乏物性曲线,影响了油藏描述工作中剩余油分布预测,导致后期调整开发方向不明确、产能建设实施风险大,严重制约了馆陶组的高效开发。针对上述难题,开展了随钻条件下测井曲线物性反演研究,首先采用直方图平移法,以顶部稳定发育的泥岩为标准,对钻遇本层位的探井及评价井测井曲线进行校正;其次开展物性敏感曲线分析,通过分析自然伽马、电阻率曲线与物性的相关性,优选自然伽马为模拟储集层物性的曲线。在此基础上,开展储集层孔渗反演,将自然伽马与孔隙度、渗透率交会,在多项式相关系数研究前提下,采用分段式交会法进行相关性研究,通过提高孔渗反演精度,确定孔隙度反演公式,使相关性得到提升,r²达到0.9以上,反演孔隙度平均相对误差在5%以内,反演渗透率全部在同一数量级范围内。采用此储集层物性表征技术,对埕海油田12口水平井进行反演,准确率达到94%以上。

关键词: 物性反演, 随钻测井, 水平井, 埕海油田

Abstract: Developed with horizontal wells,the Guantao Formation of Chenghai Oilfield in the beach area in Dagang,a heavy oil reservoir with bottom water,has logging series of logging while drilling,and the electrical logging curves of natural gamma and resistivity. The lack of physical property curves affects the prediction of remaining oil distribution in reservoir description,which leads to unclear development direction of the later adjustment and the high implementation risk of production capacity construction,seriously restricting the efficient development of Guantao Formation. On the difficulties mentioned above,physical property inversion of logging curves while drilling is carried out. First,the histogram translation method is used to calibrate the logging curves of exploratory wells and appraisal wells encountered in this horizon by taking the mudstone stably developed at the top as the standard. Secondly,by analyzing the correlation between natural gamma,resistivity curves and physical property,analysis of physical property sensitivity curves is carried out to optimize natural gamma as the curve that simulates the physical property of the reservoir. On this basis,inversion of reservoir porosity and permeability is carried out and the natural gamma and porosity,permeability are intersected. Under the premise of polynomial correlation coefficient research,the sectional intersection method is used for correlation research to improve the accuracy of porosity and permeability inversion and determine porosity inversion formula. The correlation is improved, r² reaches 0.9 or move,the average relative error of inversion porosity is within 5%,and the inversion permeability are all within the same order of magnitude. Using this reservoir physical property characterization technique,12 horizontal wells in Chenghai Oilfield are inverted with an accuracy rate of over 94%.

Key words: physical property inversion, logging while drilling, horizontal well, Chenghai Oilfield

中图分类号:

TE132.1

李宁, 刘文钰, 王建富, 唐和军, 陈春阁, 李倩. 埕海油田馆陶组水平井随钻曲线物性反演研究[J]. 录井工程, 2021, 32(1): 51-55.

LI Ning, LIU Wenyu, WANG Jianfu, TANG Hejun, CHEN Chunge, LI Qian. Inversion research on physical property of MWD curves in horizontal wells of Guantao Formation in Chenghai Oilfield[J]. Mud Logging Engineering, 2021, 32(1): 51-55.

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