Reservoir Interpretation of Intrusive Rock Buried-Hill with Mud-Logging Data while Drilling—Taking the Y Area in the Qiongdongnan Basin of the South China Sea as an Example

Xuejiao Qu, Chaobin Zhu, Xianjun Chen, Pei Chen, Bing Tan, Yixue Xiong, Shusheng Guo and Nan Jiang
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Xuejiao Qu: College of Petroleum and Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Chaobin Zhu: College of Petroleum and Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Xianjun Chen: Zhanjiang Branch of China France Bohai Geoservices Co., Ltd., Zhanjiang 524057, China
Pei Chen: Zhanjiang Branch, CNOOC China Limited, Haikou 570100, China
Bing Tan: College of Petroleum and Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Yixue Xiong: College of Petroleum and Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Shusheng Guo: Zhanjiang Branch, CNOOC China Limited, Haikou 570100, China
Nan Jiang: College of Petroleum and Gas Engineering, Chongqing University of Science and Technology, Chongqing 401331, China

Energies, 2022, vol. 15, issue 10, 1-15

Abstract: The intrusive rock buried-hill reservoir is one of the main targets for oil and gas exploration in the offshore sedimentary basins of China. In order to discover the reservoir as early as possible for decision-making to save costs, reservoir interpretation with mud-logging data needs to be studied. Previous studies have showed that the homogeneity rocks reservoir can be well interpreted with mud-logging data u the K b (mechanical specific energy ratio) method and the W L (tangential power)- W H (vertical power) intersection method. However, reservoir interpretation with mud-logging data for intrusive rock buried-hill has not been reported. The key steps or parameters of these two kinds of methods used for reservoir interpretation need to be modified for the vertical variation of intrusive rock buried-hill. Furthermore, confirming the interpretation of these two kinds of methods has not been reported. Taking the Y area in the Qiongdongnan Basin of the South China Sea as an example, the intrusive rock buried-hill can be divided into four zones based on its characteristics and genesis in descending order: the sand–gravel weathering zone, the weathering fracture zone, the inner fracture zone, and the base rock zone. The reservoir can be well interpreted when taking the M SE (mechanical specific energy) geometrical mean of the base rock zone as a basic value to calculate K b . The reservoir will also be well interpreted when W H ranges from 0 to 4.5 MPa and W L ranges from 0 to 99 MPa in the column while intersecting. The layers of the reservoir can be interpreted as K b < 1 in the sand–gravel weathering zone and the weathering fracture zone. The K b < 1 and effective intersection of W L - W H layers at the same time could be interpreted as a reservoir in the inner fracture zone and the base rock zone. After combining the K b method with the W L - W H intersection method, the reservoir of intrusive rock buried-hill can be well interpreted. The total thickness of the uninterpretable reservoir ratio is less than 20% compared to reservoir interpretation with well-logging for each well.

Keywords: Y area in the Qiongdongnan Basin; intrusive rock buried-hill; reservoir interpretation; mechanical specific energy ratio; tangential power and vertical power intersection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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