塔里木盆地塔河油田AT2井区高精度化探异常及其开发地质意义

The anomalies of high-precision geochemical exploration in well AT2 area of Tahe Oil Field, Tarim Basin and its geological significance for production

杨敏 陈叔阳 王国建

YANG Min CHEN Shuyang WANG Guojian

中国石化 西北油田分公司, 乌鲁木齐 830011 中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126

SINOPEC Northwest Oilfield Branch Company, Urumqi, Xinjiang 830011, China Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China

为了评价塔里木盆地塔河油田AT2井区三叠系中、上油组多个圈闭的含油气性，采用基于烃类微渗漏的高精度化探技术在该井区进行了油气地球化学精查研究。选用的地球化学勘探指标均为活动态指标，包括游离烃、物理吸附烃以及顶空气。采用测网方式采集了近地表土壤样品，网度为0.25 km×0.25 km，在重点圈闭上方采用了0.1 km×0.1 km加密采样网格。以游离烃甲烷、物理吸附烃甲烷、顶空气甲烷为代表性指标，研究了AT2井区地球化学异常特征。在此基础上，确定了5个综合地球化学异常区（对应于5个圈闭）。通过化探—地质双因素评价方法，对上述5个化探异常区进行了排序，评价了圈闭的含油气性，为油田滚动开发提供了地球化学依据。

To evaluate the hydrocarbon potential of multiple traps in the middle and up oil groups of Triassic, an intensive oil and gas geochemical exploration has been carried out in the well AT2 area of the Tahe Oil Field of the Tarim Basin by the means of hydrocarbon microseepage-based high-precision geochemical exploration techniques.The geochemical indicators selected for this study were all active ones, including soil gas, physical adsorbed hydrocarbon gas and headspace gas.Near-surface soil samples were collected by means of a 0.25 km×0.25 km measuring grid, with a 0.1 km×0.1 km measuring grid over some key traps.Soil gas methane, physical adsorbed methane, and headspace methane were selected as the representative geochemical indicators, and their geochemical anomaly features over the well AT2 area were studied.Based on which, five integrated geochemical anomaly zones (consistent with five traps) were determined.The five integrated geochemical anomaly zones were ranked using a double-factor evaluation method combining geochemical and geological exploration evaluation parameters, and the hydrocarbon-bearing potential of these traps were evaluated, providing a geochemical basis for oil and gas rolling development of the well AT2 area.

国家自然科学基金项目 41872126;中石化西北油田分公司科研项目 KY2019-S-016

https://doi.org/10.11781/sysydz202104670