摘要
为了解沾化凹陷泥页岩裂缝型油藏的成藏特点,对沾化凹陷罗63井沙一段碎裂岩方解石胶结物中的流体包裹体开展了岩相学及包裹体温、压及成分分析。结果表明,碎裂岩的碎粒颗粒为泥晶白云岩,碎粒之间为亮晶方解石充填胶结,其内主要发育低气液比的烃包裹体与少量共生的气液两相盐水包裹体。烃包裹体均一温度为102-110℃,盐水包裹体均一温度为115-119℃,冰点温度为-1.7--2.0℃,盐度为2.8%-3.3%NaCleqv,呈现低盐度流体的特征;烃包裹体的捕获温度为124-126℃,捕获压力为16.7-18.6 MPa;单体烃包裹体主要由碳数小于25的正构烷烃类组成,主峰碳为C15,Pr/n C17、Ph/n C18和Pr/Ph值分别为0.42、0.55和0.69,方解石胶结物捕获的轻质油应源自渤南洼陷中心相对成熟的沙四段烃源岩,捕获时的流体压力系数大于1.56。
In order to understand the characteristics of fractured shale oil reservoir in the Zhanhua depression,the petrology of cataclasite,microthermometry,trapped temperature,pressure and composition of typical hydrocarbon inclusion in calcite cement of cataclasite from the First sub-Member of the Shahejie Formation of well Luo63,Zhanhua depression,Bohai Bay basin,are performed. The results show that the cataclasite is micritic dolomite,which cemented by calcsparite.Fluid inclusions in calcite are mainly hydrocarbon inclusions and minor two phase（ gas-liquid） saline-water inclusions.The homogenization temperatures of gas-liquid hydrocarbon inclusions are from 102 oto 110 ℃,while the homogenization temperatures of gas-liquid saline water inclusions are 115 to 119 ℃. The freezing temperature of gas-liquid saline water inclusions are-1. 7--2. 0 ℃,yielding low salinity of 2. 8%-3. 3% Na Cleqv. The trapped temperature and pressure of typical hydrocarbon inclusions are at 124-126 ℃ and 16. 7-18. 6 Mpa,repectively. The compositions of single hydrocarbon inclusion are mainly domained by normal paraffin hydrocarbon with carbon atoms less than 25. Among them,the main peak is C15. The ratios of Pr/n C17,Ph/n C18 and Pr/Ph are 0. 42,0. 55 and 0. 69,respectively. The light oil trapped by calcite cement derived from mature source rocks of the Forth Member of the Shahejie Formation in the centre of Bonan sagwith pressure coefficient of trapped fluid more than 1. 56.
作者
李志明
张鑫璐
蒋宏
蒋启贵
徐二社
钱门辉
刘鹏
LI Zhi-ming;ZHANG Xin-lu;JIANG Hong;JIANG Qi-gui;XU Er-she;QIAN Men-hui;LIU Peng(Wuxi Research Institute of Petroleum Geology,RIPEP,SINOPEC,Wuxi Jiangsu 214126,China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Wuxi Jiangsu 214216,China;China University of Petroleum（Beijing）,Beijing 102249,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2018年第3期513-522,共10页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家重点基础研究发展计划项目(2014CB239101)
中国石油化工股份有限公司科技开发部项目(P14157)
关键词
碎裂岩
方解石胶结物
古温压
烃包裹体组分
沙一段
罗63井
沾化凹陷
cataclasite
calcite cement
paleo-temperature and paleo-pressure
composition of hydrocarbon inclusion
the lower First sub-Member of Shahejie Formation
well Euo63
Zhanhua depression
作者简介
李志明（1968-），男，研究员，研究方向：油气地球化学、页岩油气地质综合评价．E-mail：lizm．syky@sinopec．com．
