Fine Detection and Analysis of Hidden Karst in Wellsite with Quasi-Three-Dimensional TDEM Based on Lateral Constraint

IF 1.2 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geofluids Pub Date : 2023-11-22 DOI:10.1155/2023/2766524

Bin Wu, Yunping Liao, Hongkai Chen, Lichuan Chen, Shicong Ren, Shihong Xiao, Yunjian Yang, Yong Yang, Haiyou Peng

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Abstract

Considering that karst caves, underground rivers, and dissolution fractures in shallow carbonate formation in the Sichuan Basin are extremely developed, leakage, failure and plugging difficulties are easy to occur in the drilling process. The TDEM was used to carry out the exploration of hidden karst geological bodies in well QM2, and the quasi-three-dimensional inversion based on lateral constrain was used to invert the TDEM data. Three NW trending anomalous bands were identified in the lower Triassic Jialingjiang Formation within the range of drilling, consisting of seven relatively low-resistivity anomalous zones. Under the guidance of TDEM quasi-three-dimensional inversion resistivity data, the low-resistivity karst development area is avoided, and the specific drilling location of well QM2 is determined. No karst cave and underground river were drilled in the later drilling process of well QM2, as well as no instability phenomenon occurred. It indicates that the TDEM detection results are consistent with the actual drilling, and the quasi-three-dimensional TDEM inversion interpretation data based on lateral constraints is reliable and can accurately detect the buried karst in the wellsite.

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基于横向约束的准三维TDEM井场隐伏岩溶精细探测与分析

四川盆地浅层碳酸盐岩地层溶洞、地下河、溶蚀裂缝极为发育，钻井过程中容易出现渗漏、破坏、堵漏等困难。利用TDEM对QM2井隐蔽岩溶地质体进行勘探，采用基于横向约束的准三维反演方法对TDEM数据进行反演。在钻探范围内，发现下三叠统嘉陵江组有3条北西向异常带，共7个相对低电阻率异常带。在TDEM准三维反演电阻率数据指导下，避开低电阻率岩溶发育区域，确定QM2井的具体钻井位置。QM2井后期钻探过程中未钻出溶洞和地下河，未发生失稳现象。结果表明，TDEM探测结果与实际钻井吻合，基于侧向约束的准三维TDEM反演解释数据可靠，能够准确探测井场埋藏岩溶。

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来源期刊

Geofluids 地学-地球化学与地球物理

CiteScore

2.80

自引率

17.60%

发文量

835

期刊介绍： Geofluids is a peer-reviewed, Open Access journal that provides a forum for original research and reviews relating to the role of fluids in mineralogical, chemical, and structural evolution of the Earth’s crust. Its explicit aim is to disseminate ideas across the range of sub-disciplines in which Geofluids research is carried out. To this end, authors are encouraged to stress the transdisciplinary relevance and international ramifications of their research. Authors are also encouraged to make their work as accessible as possible to readers from other sub-disciplines. Geofluids emphasizes chemical, microbial, and physical aspects of subsurface fluids throughout the Earth’s crust. Geofluids spans studies of groundwater, terrestrial or submarine geothermal fluids, basinal brines, petroleum, metamorphic waters or magmatic fluids.