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- Title
New insights of the genesis of ultra-deep dolomite reservoirs in Well TS1, Tarim Basin: Evidence from in situ carbon and oxygen isotope analysis.
- Authors
Zi-cheng CAO; Dong-hua YOU; Li-xin QI; Lu YUN; Wen-xuan HU; Zong-jie LI; Yi-xiong QIAN; Yong-li LIU
- Abstract
The ultra-deep Well TS1 in the Tarim Basin revealed high-quality dolomite reservoirs at the depth of 8 408 m, but the genesis mechanism of the reservoir space is controversial. Based on detailed core description, microscopic petrological observation, and analysis of filling sequence of the cements in pores, micromill samples of matrix, early dolomite cements and late dolomite cements were obtained by in situ sampling method after the cathodoluminescenece analysis of the thickeded thin sections and analyzed for carbon and oxygen isotopes. The early dolomite cements and the dolomite matrix had relatively consistent results of carbon and oxygen isotope distribution characteristics, while the later dolomite cements had more negative δ13C and δ18O values. The cements filling sequence in pores and carbon and oxygen isotope analysis results show that different types of dolomite are the products of multi-stage dolomitization, which means that pores had been formed when the the dolomitization occureed and continued to disappear with increasing depth. The formation of the dark gray dolomite reservoir space of Avatage Formation in the Middle Cambrian should be related to the near-subsurface diagenetic events during the penecontemporaneous period.
- Subjects
ISOTOPIC analysis; CARBON isotopes; DOLOMITE; OXYGEN isotopes; RESERVOIRS
- Publication
Natural Gas Geoscience, 2020, Vol 31, Issue 7, p3
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2020.03.005