油基钻井液条件下气测衍生参数法的构建与在流体判识中的应用

doi:10.3969/j.issn.1672-9803.2022.04.010

摘要/Abstract

摘要： 西湖凹陷储层烃类流体以轻质油和凝析气为主,但是受油基钻井液体系和储层本身特性的影响,传统的气测解释方法和图板在储层流体解释评价中具有局限性。为解决这一难题,对西湖凹陷已钻探井的气测数据进行统计分析,通过改进传统3H比值法,建立了GO-I油气指数解释模型,并利用交会面积对流体密度进行预测。研究结果表明,油基钻井液条件下的GO-I油气指数解释模型及交会面积预测流体密度模型得到的结果与电缆测试结论相吻合,实现了井场流体性质、油气密度的随钻快速识别。该方法分析方便快捷,解决了油基钻井液条件下储层流体判识难的问题,具有较好的效果和应用前景,可为后期地质作业决策及油气藏评价提供技术支撑。

关键词: 气测录井, 西湖凹陷, 油基钻井液, GO-I油气指数解释模型, 交会面积法, 凝析气藏, 流体识别

Abstract: Dissolution pores and cavities are the main reservoir space of the carbonate rocks of Dengying Formation in The hydrocarbon-bearing fluids in the reservoirs of Xihu sag is mainly ligh oil and condensate gas, but influenced by the oil-based drilling fluid system and the properties of the reservoir itself, the traditional gas logging interpretation methods and charts have limitations in the interpretation and evaluation of reservoir fluids. To solve this problem, the statistics and analyses were made for the gas logging data of drilled wells in Xihu sag. By improving the traditional 3H ratio method, the GO-I interpretation model for oil and gas indices was established, and the fluid density is predicted by using the crossplot area. We found that the results of the GO-I interpretation model for oil and gas indices and the model for crossplot area predicting fluid density are consistent with the wireline test results in oil-based drilling fluid, realizing the rapid identification of fluid properties and hydrocarbon density while drilling at the well site. This method is convenient and fast to analyze, solves the problem of difficult discrimination of reservoir fluid in oil-based drilling fluid, has good effects and application prospects, and provides technical support for later geological operation decision-making and reservoir evaluation.

Key words: gas logging, Xihu sag, oil-based drilling fluid, GO-I interpretation model for oil and gas indices, crossplot area method, condensate gas reservoir, fluid discrimination

中图分类号:

TE132.1

景社, 蔡军, 王雷, 兰晶晶, 袁胜斌. 油基钻井液条件下气测衍生参数法的构建与在流体判识中的应用[J]. 录井工程, 2022, 33(4): 54-60.

JING She, CAI Jun, WANG Lei, LAN Jingjing, YUAN Shengbin. Construction of gas logging derived parameter method in oil-based drilling fluid and its application in fluid discrimination[J]. Mud Logging Engineering, 2022, 33(4): 54-60.

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