沉积学报2017，Vol.35Issue(6)：1205-1216,12.DOI:10.14027/j.cnki.cjxb.2017.06.012
断层流体锶、碳、氧同位素示踪评价断层垂向封闭性 ——以焦石坝背斜带为例
Evaluation of Vertical Sealing of Faults by Strontium, Carbon and Oxygen Isotope Tracing of Fault Fluid: A case from the anticlinal belt in Jiaoshiba area
摘要
Abstract
Because the strontium isotope is not easy to be fractionated and can be compared with the time, the stronti-um isotope can be used as an effective index of fluid tracing. Oxygen isotopes can reflect the temperature, fluid and other factors, and carbon isotopes can reflect the organic matter, so they can be used as the strontium isotope supple-ment. The time and possibility of opening of in different parts of the fault can be judged by using fluid tracing diagram. In this paper, we take the example of faults around the anticlinal belt Jiao Shi Ba and make use of strontium, carbon and oxygen isotopes in the veins to study the vertical sealing of faults. The evaluation results show that the strata under the Silurian strata are communication in this area and there is a period of strontium-rich fluid from deep crust. But pro-tected by decollement from mudstone in the Silurian strata, the period of strontium rich fluid cannot migration to upper strata through faults. This area was at last through two times of tectonic movement in the late period. Aiming at Silurian Longmaxi shale gas reservoir, different faults have obvious differences. From the plane of view, the vertical sealing of faults in the middle of Fangdoushan fault zone, and the south of Daershan fault zone, the south of Wujiang fault zone is bad. The vertical sealing of faults in the north of Wujinag fault zone, the south of Tiantaichang fault zone is medium. The vertical sealing of faults in the north of Fangdoushan fault zone, the south of Fangdoushan fault zone, and the north of Tiantaichang fault zone is good.关键词
锶同位素/碳、氧同位素/断层垂向封闭性/焦石坝Key words
strontium isotope/carbon and oxygen isotope/vertical sealing of fault/Jiaoshiba分类
天文与地球科学引用本文复制引用
马强,张殿伟,王贵文,朱东亚,张荣强,李天义..断层流体锶、碳、氧同位素示踪评价断层垂向封闭性 ——以焦石坝背斜带为例[J].沉积学报,2017,35(6):1205-1216,12.基金项目
中国石化科技部项目(P16083)[Science and Technology Department of the SINOPEC, No. P16083] （P16083）
