Natural Gas Geoscience >

2010 , Vol. 21 >Issue 3: 389 - 396

DOI: https://doi.org/10.11764/j.issn.1672-1926.2010.03.389

article

Characteristics of Hydrocarbon Fluid in the Ordovician  Vein Calcite of Tazhong No.1 Slope-Break Zone

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  • 1.State Key Laboratory of Enhanced Oil Recovery ,Research Institute of Petroleum Exploration and Development， Beijing 100083,China;2.School of Earth Sciences and Resources, CUGB,Beijing 100083,China;3.Tarim Oilfield Company, PetroChina, Korla 841000, China

Received date: 2010-01-26

  Revised date: 2010-03-21

  Online published: 2010-06-10

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Abstract

More than 90% oil and gas reservoirs in the Middle and Upper Ordovician of Tazhong Slope-Break Zone-Ⅰ are related to fractures. The fractures in Ordovician of Tazhong are divided into 2 kinds (diagenesis fractures and structural fractures), including 17 types, by the cross-cutting relation of fractures and features of hydrocarbon inclusions in fracture filler. The structural fractures can be divided into three periods by chronological order of the fracture formation. The features of hydrocarbon inclusions in the vein calcite suggest four periods of hydrocarbon inclusions. Results of carbon, oxygen and strontium isotopes experiments on vein calcites with various hydrocarbon inclusions suggest that the vein calcites were filled in the anadiagenetic stage. Vein calcites containing Ⅰ-OL and Ⅲ-OLG were mixed by the deep Cambrian remelted strontium, whereas vein calcites containing Ⅱ-OL and Ⅳ\|OLG were controlled by the remelted strontium of Ordovician surrounding bed. In the Late Caledonian-Early Hercynian，hydrocarbon sourced from Cambrian source rocks of Tazhong Slope-Break Zone-Ⅰ migrated upwards through the Middle-Upper Ordovician limestone, but didn′t accumulate. In the Late Hercynian, hydrocarbon sourced from the Lower-Middle Ordovician source rocks of Manjiaer depression migrated to carbonate reservoirs of the Middle-Upper Ordovician and accumulated. The contemporaneous hydrocarbon sourced from the Lower Cambrian migrated to the Middle-Upper Ordovician carbonate reservoirs. Ⅳ-OLG formed in Himalayan was familiar in wells of TZ26、TZ24 and TZ62, but not in wells of northwest Tazhong Slope-Break Zone-Ⅰ. Hydrocarbon might migrate from northwest to southeast and formed present hydrocarbon reservoirs. Ⅲ-OLG and Ⅳ-OLG were crucial for huge petroleum accumulation.

Key words： Tazhong No.1 slope-break zone; Ordovician; Vein calcite; Inclusion; Isotope.

Cite this article

ZHANG Nai,ZHAO Zong-ju,XIAO Zhong-yao,ZHANG Bao-min,ZHANG Bao-shou,CHEN Yan-gui . Characteristics of Hydrocarbon Fluid in the Ordovician  Vein Calcite of Tazhong No.1 Slope-Break Zone[J]. Natural Gas Geoscience, 2010 , 21(3) : 389 -396 . DOI: 10.11764/j.issn.1672-1926.2010.03.389

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