Petroleum accumulation conditions of the Paleogene Shahejie formation in Qingdong Sag of Bohai Bay Basin, Eastern China

The decision tree method can be used to identify complex volcanic rock lithology by dividing lithology sample data layer by layer and establishing a tree structure classification model. Mesozoic volcanic strata are widely developed in the Bohai Bay Basin, the rock types are complex and diverse, and the logging response is irregular. Taking the D oilfield of the Laizhouwan Sag in the Bohai Bay Basin as an example, this study selects volcanic rocks with good development scales and single-layer thicknesses of more than 0.2 m as samples. Based on a comparison of various lithology identification methods and both coring and logging data, using the decision tree analysis method and the probability density characteristics of logging parameters, six logging parameters with good sensitivity to the response of the volcanic rocks of the above formation are selected (resistivity (RD), spontaneous potential (SP), density (ZDEN), natural gamma ray (GR), acoustic (DT), and compensated neutron correction (CNCF) curves), which are combined to form a lithology classifier with a tree structure similar to a flow chart. This method can clearly express the process and result of identifying volcanic rock lithology with each logging curve. Additionally, crossplots and imaging logging are used to identify the volcanic rock structure, and the core data are used to correct the identified lithology. A combination of conventional logging, imaging logging and the decision tree method is proposed to identify volcanic rock lithology, which substantially improves the accuracy of rock identification.

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“…The Laizhouwan Sag, located in the southeastern Bohai Bay Basin, is a Cenozoic depression developed on a Mesozoic base [29][30][31] (Fig. 1a).…”

Section: Geological Backgroundmentioning

confidence: 99%

Application of the decision tree method to lithology identification of volcanic rocks-taking the Mesozoic in the Laizhouwan Sag as an example

Duan

Xie

et al. 2020

Sci Rep

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“…The regional caprocks mainly include mudstone in the first and second sections of the Linshui Formation and superjacent in the Meishan Formation. The trap styles mainly include draping anticlines, fault noses, and fault blocks as well as composite traps under the tectonic setting (Lv et al, 2011(Lv et al, , 2016Tao et al, 2006). The above-mentioned traps were found to have good combinations of reservoirs and caps, and it is known that the key to natural gas pool formation is whether or not highly mature coal-measure source rock masses are present.…”

Section: Distribution Of the Gas Accumulation Beltsmentioning

confidence: 99%

Characteristics of coal-measure source rock and gas accumulation belts in marine-continental transitional facies fault basins: A case study of the Oligocene deposits in the Qiongdongnan Basin located in the northern region of the South China Sea

Zhang

Wang

Zeng³

et al. 2019

Energy Exploration & Exploitation

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This study carried out the development and distribution prediction research on coal-formed gas accumulation belts from the perspectives of the development and distribution of the coal measure source rock and the thermal evolution degrees of those rock masses in marine-continental transitional facies fault basins. The purpose of the current study was to improve the accuracy of gas reservoir explorations in the sea areas. The methods used in this study were based on the systematic analyses of the drilling, logging, geochemistry, and seismic data of the Oligocene deposits in the Qiongdongnan Basin of the northern region of the South China Sea. It had been previously established that the sedimentary processes of the fault basin were mainly controlled by faulting, and (fan) deltas had often developed in the fault bending sections, tectonic transformation sections, and fault ends. The distribution along the fault zone was observed to be beaded.

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Coal-bed methane geology of the No. 2 coal seam in Fengfeng Coalfield, North China

Wen

et al. 2019

Arab J Geosci

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Petroleum accumulation conditions of the Paleogene Shahejie formation in Qingdong Sag of Bohai Bay Basin, Eastern China

Cited by 8 publications

References 8 publications

Application of the decision tree method to lithology identification of volcanic rocks-taking the Mesozoic in the Laizhouwan Sag as an example

Application of the decision tree method to lithology identification of volcanic rocks-taking the Mesozoic in the Laizhouwan Sag as an example

Characteristics of coal-measure source rock and gas accumulation belts in marine-continental transitional facies fault basins: A case study of the Oligocene deposits in the Qiongdongnan Basin located in the northern region of the South China Sea

Coal-bed methane geology of the No. 2 coal seam in Fengfeng Coalfield, North China

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