烃源岩有机地化参数的测井综合评价方法及应用  

Comprehensive evaluation method of source rock organic geochemical parameters by well logs and application

作　　者：吴迅达 孙婷 WU Xun-da;SUN Ting(Zhanjiang Branch of CNOOC（China）,Guangdong Zhanjiang 524057,China)

机构地区：[1]中海石油( 中国) 有限公司湛江分公司,广东湛江524057

出　　处：《地球物理学进展》2018年第5期2015-2019,共5页Progress in Geophysics

摘　　要：测井资料已广泛应用于烃源岩识别与有机碳含量评价,但其他有机地化参数的测井评价方法则少见报道.要实现测井资料的烃源岩综合评价,仅有有机碳含量的评价参数是不够的,需要建立配套的有机地化参数评价方法与技术.研究建立了多个有机地化多参数的测井评价模型,形成了较为完善的烃源岩测井综合评价方法与技术.有机碳含量TOC采用较为成熟的ΔLog R法计算,热解参数S_2通过岩心分析数据刻度测井的方法获得.将测井资料计算的烃源岩的含烃饱和度转换为含烃量的重量百分比,形成了氯仿沥青"A"的测井计算模型.使用TOC和氯仿沥青"A"交会图分析技术,分析二者的相关关系及分布规律,导出了多个有机地化参数的计算方法.应用交会图数据分布的外包络线形成了计算生烃量的一元二次数值计算模型和确定有效烃源岩TOC下限的方法.在此基础上,导出了计算排烃量、生烃效率、排烃效率的测井计算模型.以中国南海西部北部湾盆地乌石凹陷一口井流沙港组二段烃源岩地化参数测井综合评价为例,详细地介绍了测井烃源岩综合评价的方法与流程.Well log data has been widely used in source rock identification and evaluation of organic carbon content（ TOC）,but the well log evaluation method of organic geochemical parameters is rarely reported. In order to get the comprehensive evaluation of source rock,the parameters of TOC is not enough,we need to build a complete set of geochemical parameters evaluation methods and technology by using well logs. A set of organic geochemical parameter calculating models have been established in this study,thus forminga relatively complete logging comprehensive evaluation method and technology of source rocks. TOC is calculated by relatively mature ΔLog R method,and pyrolysis parameter S2 is obtained by core analysis data calibration logging data method. By converting source rock＇s hydrocarbon saturation that calculated from well log data into hydrocarbon weight percentage, the logging calculation model of chloroform bitumen ＂A ＂ has been set up.Using TOC and chloroform bitumen＂A＂crossplot,we analyzed the correlation and distribution of these two parameters. The calculation method of multiple organic geochemical parameters were deduced as well. The A yuan quadratic equation of hydrocarbon generation quantity data model and the effective hydrocarbon source rock TOC threshold cutoff value has been built from crossplot distribution outsourcing attentive data. On this basis,the calculated quantity of hydrocarbon expulsion, hydrocarbon generation efficiency and hydrocarbon expulsion efficiency well log calculation models were developed We analyzed a well which located at Wushi Sag of South China Sea Beibu Gulf Basin by using this method,the evaluation method and its application of source rock organic geochemical parameters by well logs have been introduced in detail.

关 键 词：烃源岩 有机地化参数 氯仿沥青“A” 生烃量 排烃量 交会图 测井综合评价 

分 类 号：P631[天文地球—地质矿产勘探]