Citation: | LI Jianping, XU Wei, YAN Zhuoyu, ZHANG Cheng, XIONG Lianqiao. Controlling factors on the effectiveness of turbidite fan reservoir of the Meishan Formation, Qiongdongnan Basin[J]. Marine Geology & Quaternary Geology, 2023, 43(3): 157-166. doi: 10.16562/j.cnki.0256-1492.2022090602 |
The turbidite fan of Miocene Meishan Formation in Qiongdongnan Basin is one of the main contributors of natural gas in the area. To increase the natural gas reserve and production in this area, the sedimentary mechanism, the controlling factors and prediction methods were studied. According to a large number of DST, geological fluid sampling, core and rotary sidewall coring measured data, and relevant enterprise standards, the turbidite fan reservoir of the could be divided into four levels of grade: high-quality, good, effective, and tight. The four levels correspond to high production, commercial production capacity, merely productive capacity, and dry layer. Results show that the type of turbidite fans and its internal composition, bottom current reformation, and reservoir effectiveness are key factors on reservoir prediction success. Fault-terrace basin floor fans, basin floor fans cut by canyon, and integral basin floor fans are three types of relatively good reservoirs; and bottom current reworking is important to improve the reservoir of middle fan and outer fan in open flow environment. For the basin floor fan cut by canyon, the lithological side seal needs to be focused in the future. For the integral basin floor fans, the reservoir pinch out shall be considered too. At present, the rate of reservoir prediction of the Meishan turbidite fans in this area is very low. The methods developed in this study shall be of great value to improve the success rate of reservoir prediction.
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Distribution of submarine fan of the Meishan Formation and stratigraphic sequence of the Neogene in the Qiongdongnan Basin
Pictures of turbidite thin-sections in the Meishan Formation, Qiongdongnan Basin
Relationship between reservoir physical properties and burial depth of turbidite in the Meishan Formation, Qiongdongnan Basin
Cross plot of porosity and permeability of turbidite sandstones from core and rotary sidewall coring hole of the Meishan Formation in the Qiongdongnan Basin
Distribution of rock clastic composition of the Meishan Formation, Qiongdongnan Basin
Plane distribution of heavy minerals in the Meishan Formation reservoir in the northwest of central depression of the Qiongdongnan Basin
Variations in porosity and permeability of turbidite fan in the Huangliu and Meishan Formations in coring section of the well A-7
Identification marks of turbidite fan reworked by bottom currents in the Well A-1
Crossing well seismic sections of basin floor fan cut by canyon in the Meishan Formation
Seismic attribute of the root mean square amplitude of the basin floor fan B