Quick Evaluation of Present-Day Low-Total Organic Carbon Carbonate Source Rocks from Rock-Eval Data: Middle–Upper Ordovician in the Tabei Uplift, Tarim Basin

Quick Evaluation of Present-Day Low-Total Organic Carbon Carbonate Source Rocks from Rock-Eval Data: Middle–Upper Ordovician in the Tabei Uplift, Tarim Basin
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This work is supported by the China Postdoctoral Science Foundation (grant No. 2017M611108), the National Science and Technology Major Project of China (grant No. 2016ZX05006006-001), and the National Basic Research Program of China (grant Nos. 2011CB2011-02 and 2014CB239100). We appreciate the Tarim Oilfield Company, PetroChina, especially the Research Institute of Exploration and Development, for providing samples and permission to publish the results. We thank Li Hui, Zhang Kun and Xi Shasha for helping us improve figures. We also thank the reviewers for their constructive comments and great suggestions that improved the manuscript.

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    Previous studies have postulated the contribution of present-day low-total organic carbon (TOC) marine carbonate source rocks to oil accumulations in the Tabei Uplift, Tarim Basin, China. However, not all present-day low-TOC carbonates have generated and expelled hydrocarbons; therefore, to distinguish the source rocks that have already expelled sufficient hydrocarbons from those not expelled hydrocarbons, is crucial in source rock evaluation and resource assessment in the Tabei Uplift. Mass balance can be used to identify modern low-TOC carbonates resulting from hydrocarbon expulsion. However, the process is quite complicated, requiring many parameters and coefficients and thus also a massive data source. In this paper, we provide a quick and cost effective method for identifying carbonate source rock with present-day low TOC, using widely available Rock-Eval data. First, we identify present-day low-TOC carbonate source rocks in typical wells according to the mass balance approach. Second, we build an optimal model to evaluate source rocks from the analysis of the rocks’ characteristics and their influencing factors, reported as positive or negative values of a dimensionless index of Rock-Eval data (IR). Positive IR corresponds to those samples which have expelled hydrocarbons. The optimal model optimizes complicated calculations and simulation processes; thus it could be widely applicable and competitive in the evaluation of present-day low TOC carbonates. By applying the model to the Rock-Eval dataset of the Tabei Uplift, we identify present-day low-TOC carbonate source rocks and primarily evaluate the contribution equivalent of 11.87×109 t oil.

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CHEN Junqing, PANG Xiongqi, YANG Haijun, PANG Hong, PANG Bo.2018. Quick Evaluation of Present-Day Low-Total Organic Carbon Carbonate Source Rocks from Rock-Eval Data: Middle–Upper Ordovician in the Tabei Uplift, Tarim Basin[J]. ACTA GEOLOGICA SINICA(English edition),92(4):1558~1573

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  • 收稿日期:2017-10-19
  • 最后修改日期:2018-02-10
  • 在线发布日期: 2018-08-21
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