Optimization of TOC well logging prediction models and their application to source rock evaluation in the Shanan Sag of Bohai Sea

XU Shikun; YE Jiaren; YANG Baolin; ZHAO Niubin

doi:10.16562/j.cnki.0256-1492.2019092901

Marine Geology & Quaternary Geology > 2020 > 40(5): 182-191. > DOI: 10.16562/j.cnki.0256-1492.2019092901

XU Shikun, YE Jiaren, YANG Baolin, ZHAO Niubin. Optimization of TOC well logging prediction models and their application to source rock evaluation in the Shanan Sag of Bohai Sea[J]. Marine Geology & Quaternary Geology, 2020, 40(5): 182-191. DOI: 10.16562/j.cnki.0256-1492.2019092901

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Optimization of TOC well logging prediction models and their application to source rock evaluation in the Shanan Sag of Bohai Sea

Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences (Wuhan), Wuhan 430074, China

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Received Date: September 28, 2019
Revised Date: April 17, 2020
Available Online: July 02, 2020

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Abstract

Abstract

Oil and gas exploration degree of the Shanan Sag of the Bohai Basin is relatively low due to lack of drilling cores and source rock samples. TOC logging prediction models for source rocks are established in this paper for the Members of E₃d₃、E₃s₁₊₂、E₂s₃ by the multiple linear regression method and the improved ΔlgR method based on the logging data and limited measured TOC data of the mudstone samples collected from six single wells. After comparison and optimization, it is found that both the improved ΔlgR method and the four- parameter linear regression method are effective to predict the TOC vertical distribution pattern of the lacustrine source rocks in single wells in the Sag and the improved ΔlgR method is obviously more efficient. Therefore, predicted TOC curve of improved ΔlgR is selected to evaluate the source rocks for two representative single wells. The result shows that the E₂s₃ is characterized by high ratio of source rocks, high TOC content and large thickness of high-quality source rocks. It is the main source rock of the study area and the Shanan sag must have good prospect for oil and gas exploration. The research results are helpful to the evaluation of source rocks in the Shanan sag and will provide solid scientific basis for further understanding of oil and gas exploration potential in the study area.
- source rocks,
- organic carbon content,
- logging evaluation,
- Shanan Sag

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References (24)

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