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Geochemical characteristics and genesis of Lower Ordovician dolomite in the southwest Tarim Basin, Northwest China

机译：Geochemical characteristics and genesis of Lower Ordovician dolomite in the southwest Tarim Basin, Northwest China

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abstract_textpThe Ordovician dolomite stratum in the southwest Tarim Basin is rich in oil and gas, but the reservoir is characterized by low porosity, low permeability, and strong heterogeneity. Using drill core samples, this study examined the petrologic features, geochemical characteristics, homogenization temperatures of inclusions, and the genesis of dolomite in the Lower Ordovician was discussed. Results showed that in the Penglaiba and Yingshan Formation dolomite content decreased from bottom to top. The predominant type of dolomite was silt to fine, with middlecoarse and saddle dolomite distributed along fractures and the bottom of the Penglaiba Formation. delta C-13 values ranged between -2.6 parts per thousand and 0.7 parts per thousand, delta O-18 fluctuated between -3.5 parts per thousand and -9.4 parts per thousand, Sr-87/Sr-86 values were 0.7087- 0.7104, and part of the value exceeded largest value of Ordovician. In addition, inclusion data could be divided into four groups, indicated there were at least three stage of diagenetic fluid (100-110 degrees C; 120-150 degrees C; 160-170 degrees C) and one hydrothermal fluid (180-210 degrees C) activity. The genesis of dolomite in the study area was mainly contemporaneous - penecontemporaneous dolomitization, with burial and hydrothermal dolomitization around fractures and fault zones./p/abstract_text

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