摘要
渤中凹陷东营组地层普遍发育超压,对其超压地质成因仍有争议。前人通过声波速度与有效应力图板法分析,认为东营组超压以欠压实成因为主,而东营组发育大段泥岩地层,其中的高有机碳含量对于声波时差的影响不容忽视。基于地化录井资料对重点井的声波时差曲线进行了有机碳含量校正,重新分析了东营组超压层特征,并探讨了烃源岩超压成因分类。结果表明:渤中凹陷东营组超压层普遍具有高有机碳含量特征,声波时差经过校正后明显减小,平均降低幅度16.8%,将校正后的资料进行重新投点,表现为流体膨胀特征,这一结论与地层响应特征相符,有助于提高区域地层压力预监测精度,对其他地区烃源岩层系超压成因研究具有借鉴意义。
The strata of Dongying Formation in Bozhong Sag generally develop overpressure,and the geologic origin of the overpressure remains controversial.Previous studies have analyzed the overpressure of the Dongying Formation using acoustic velocity and effective stress chart method,and concluded that the genesis of overpressure was mainly undercompaction.Large sections of mudstone strata were developed in Dongying Formation,in which the influence of high organic carbon content on interval transit time cannot be ignored.Based on geochemical logging data,the organic carbon content was corrected on the interval transit time curves of key wells,the characteristics of overpressure strata in Dongying Formation were re-analyzed,and the genetic classification of source rock overpressure was discussed.The results showed that the overpressure strata of Dongying Formation in Bozhong Sag generally had the characteristics of high organic carbon content,and the interval transit time decreased obviously after correction,with an average reduction of 16.8%.The drop points of the corrected data showed the characteristics of fluid expansion.This conclusion is consistent with bed response characteristics,which is helpful to improve the precision of regional pre-monitoring of formation pressure,and has reference significance for the research on the genesis of overpressure of source rock system in other areas.
作者
杨毅
郭东明
程乐利
袁胜斌
陈恭洋
印森林
YANG Yi;GUO Dongming;CHENG Leli;YUAN Shengbin;CHEN Gongyang;YIN Senlin(China France Bohai Geoservices Co.,Ltd.,Tianjin 300457,China;Institute of Mud Logging Technology and Engineering,Yangtze University,Jingzhou,Hubei 434023,China)
出处
《录井工程》
2023年第2期103-108,共6页
Mud Logging Engineering
基金
中法渤海地质服务有限公司项目“地层压力预监测系统的研制与开发”(编号:CFG-TG-TI-2019-009)。
关键词
渤中凹陷
东营组
有机碳含量校正
超压特征
超压成因
Bozhong Sag
Dongying Formation
organic carbon content correction
overpressure characteristics
genesis of overpressure
