基于优化热解分析的页岩油储层含油性快速评价——以涠西南凹陷流沙港组二段下亚段为例  

Quick evaluation of oil-bearing property of shale reservoirs based on optimized pyrolysis analysis:a case study of E2l2(1)in Weixinan Sag

作　　者：韩学彪 陈沛 杨毅 袁胜斌 胡益涛 王瑞科 HAN Xuebiao;CHEN Pei;YANG Yi;YUAN Shengbin;HU Yitao;WANG Ruike(China-France Bohai Geoservices Co.,Ltd.,Tianjin 300452,China;Zhanjiang Brunch,CNOOC China Limited,Zhanjiang 524000,China)

机构地区：[1]中法渤海地质服务有限公司,天津300452 [2]中海石油(中国)有限公司湛江分公司,广东湛江524000

出　　处：《断块油气田》2025年第2期221-226,共6页Fault-Block Oil & Gas Field

基　　金：中国海洋石油集团有限公司“十四五”重大科技项目“海上深层/超深层油气勘探技术”(KJGG2021-0400)。

摘　　要：基于井场分析技术快速定量表征不同赋存状态页岩油含量,是页岩油地质甜点评价和钻完井决策的重要基础。采用常规岩石热解、分段岩石热解和井场密闭热释等方法,对涠西南凹陷流沙港组二段下亚段页岩油层系开展含油性实验研究。结果表明:1)分段岩石热解通过细分温度区间获取更加丰富的参数,能够更好地定量表征不同赋存状态页岩油的含量,大大提升了页岩油研究结果的准确性和精细化程度;2)井场密闭热释利用低温密闭技术,有效解决了样品制取样过程中烃类损失的难题,可快速准确获取气态烃含量和轻烃含量,弥补了传统热解对该部分测量精度低的不足,对含油性和可动性评价具有重要意义;3)开展不同方法之间数据相关性研究,建立了最大可动油含量、轻烃含量的恢复公式;4)综合最大可动油含量、总有机碳质量分数,将流沙港组二段下亚段页岩油资源划分为低效、有效和富集3类。井场多技术创新融合的含油性快速评价方法,可驱动页岩油储层地质甜点认识不断深化,为实现非常规油气增储上产提供关键技术支持。Quick quantitative characterization of shale oil content in different occurence states based on wellsite analysis technology is a crucial foundation for geological sweet spot evaluation and drilling and completion decisions of shale oil.Experimental studies on oil-bearing property were conducted on the shale oil formations of E2l2(1)using methods such as conventional rock pyrolysis,multi-stage rock pyrolysis and wellsite sealed thermal desorption.The results show that:(1)By subdividing temperature intervals,more abundant parameters can be obtained by multi-stage rock pyrolysis,which can better quantitatively characterize the content of shale oil in different occurrence states,and greatly improve the accuracy and refinement of shale oil research results.(2)Wellsite sealed thermal desorption technology effectively solves the problem of hydrocarbon loss during sample preparation and sampling by using low-temperature sealing technology,and can quickly and accurately obtains gaseous hydrocarbon content and light hydrocarbon content,compensating for the low measurement accuracy of traditional pyrolysis in this regard,which is of great significance for oil-bearing property and mobility evaluations.(3)By conducting data correlation studies between different methods,the recovery formulas of maximum movable oil content and light hydrocarbon content were established.(4)By integrating maximum movable oil content and TOC,the shale oil resources of E2l2(1)were further classified into three categories:low efficiency,effective,and enriched.The wellsite multi-technology innovation and integration of quick analysis of oil-bearing property can drive the deepening of the understanding of geological sweet spot,providing key technical support for the realization of unconventional oil and gas reserve and production increase.

关 键 词：页岩油 分段岩石热解 井场密闭热释技术 含油性 可动性 涠西南凹陷 

分 类 号：TE122.2[石油与天然气工程—油气勘探]