准噶尔盆地南缘地区含膏质地层岩性特征及测井识别方法  

Lithological Characteristics and Logging Identification Methods of Gypsum-Bearing Strata in Southern Margin Area of Junggar Basin

作　　者：庞志超 肖华 毛晨飞 陈国军 梁琬坤 高明 张啸 Pang Zhichao;Xiao Hua;Mao Chenfei;Chen Guojun;Liang Wankun;Gao Ming;Zhang Xiao(Exploration and Development Research Institute,PetroChina Xinjiang Oilfield Company,Urumqi 830013,China;Geological Research Institute,China National Logging Corporation,Xi'an 710077,China)

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,乌鲁木齐830013 [2]中国石油集团测井有限公司地质研究院,西安710077

出　　处：《吉林大学学报（地球科学版）》2024年第4期1419-1431,共13页Journal of Jilin University：Earth Science Edition

基　　金：中国石油天然气集团有限公司科技专项(2023ZZ14);中国石油集团测井有限公司项目(CPL2021-B03)。

摘　　要：近来年准噶尔盆地南缘地区中生界碎屑岩油气藏屡获突破,成为盆地重要的勘探领域。中生界普遍含有石膏,因此含膏质地层的岩性优选是储层评价的关键。为提高该区岩性识别的精度,并对含膏质地层储层曲线进行校正,本文基于岩石物理实验,分析不同岩性的测井曲线响应特征,对比发现含膏质地层导致补偿中子值降低、声波时差减小、电阻率升高;对含膏质岩性进行了测井识别,并提出了蒙特卡罗数值模拟方法,对膏质砂岩进行不同孔隙度、不同膏质体积分数条件下的补偿中子测井地层模拟,建立了补偿中子孔隙度曲线校正模型,最终实现了岩性的精细划分。解释的岩性与薄片分析对比符合率达到88.2%。In recent years,the Mesozoic clastic oil and gas reservoirs in the southern margin of Junggar basin have made breakthroughs and become an important exploration field in the basin.Mesozoic strata generally contain gypsum,so the lithology optimization of gypsum-bearing strata is the key to reservoir evaluation.In order to improve the accuracy of lithology identification in this area and correct the reservoir curves of gypsum-bearing strata,the response characteristics of logging curves of different lithologies based on petrophysical experiments is analyzed,and it is found that the gypsum-bearing strata will lead to the decrease of compensated neutron value,the decrease of acoustic time difference and the increase of resistivity.The gypsum lithology is identified by logging.The Monte Carlo numerical simulation method is proposed to simulate the compensated neutron logging formation under the conditions of different porosity and different gypsum volume fraction in gypsiferous sandstone.A correction model of the compensated neutron porosity curve is established,and the fine division of lithology is finally realized.The coincidence rate between the interpreted lithology and the thin section analysis reaches 88.2%.

关 键 词：准噶尔盆地南缘 中生界 含膏质地层 蒙特卡罗数值模拟 岩性识别 测井 

分 类 号：TE311[石油与天然气工程—油气田开发工程] P631.8[天文地球—地质矿产勘探]