The reservoir characteristics and their significance for deliverability in metamorphic granite buried hill: a case study
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ORIGINAL PAPER
The reservoir characteristics and their significance for deliverability in metamorphic granite buried hill: a case study from the JZS oil field in the Liaodong Bay Basin, NE China Tao Ye 1
&
Ajuan Wei 1 & Zhe Sun 1 & Kunshun Gao 1 & Qi Cheng 1
Received: 28 April 2019 / Accepted: 5 September 2019 # Saudi Society for Geosciences 2019
Abstract The previous studies show that the fractures are the main reservoir space of metamorphic rocks. But the oil and gas production capacity of the fracture segment is obviously different in JZS oil field. Demarcating the reservoir zones finely and finding the high quality seepage of reservoirs are the keys to explore and develop the metamorphic rock oil field efficiently. Based on the data of cores, thin section, physical property, conventional logging, imaging logging, and production logging, the reservoir types and their logging response characteristics of the JZS oil field in Liaodong Bay Basin were analyzed, and the differences in capacity of different zones of reservoirs are discussed. The results show that (1) the reservoir of the study area can be divided into weathering crust zone, natural fractures zone, and structural breccia zone, and different reservoirs have different logging response characteristics; (2) the weathering crust zone and the structural breccia zone are the main effective seepage reservoirs, and the seepage capacity of the fractured reservoir is greatly changed; and (3) the reservoir type, fracture density, and the relationship between fracture and that of maximum principal stress control the deliverability difference of the metamorphic rock reservoir. Keywords Liaodong Bay . Metamorphic granite buried hill . Reservoir characteristics . Well-logging response . Deliverability difference
Introduction The Paleogene has been the main horizon for hydrocarbon exploration in Liaodong Bay Basin (LDBB), and the sandstone reservoir is the primary target. Without primary pores, the metamorphic granite rock of Archean strata below the main oil production zone did not attract enough attention from geologists since 2003. With the increasing difficulty for conventional oil-gas exploration, buried hill has created a great deal of interest for exploring in recent years (Kang et al. 2008). JZS oil field, with the proved reserves of 2.5 × 108 bbl, is the largest metamorphic buried hill oil field in Liaodong Bay Basin.
Responsible Editor: Santanu Banerjee * Tao Ye [email protected] 1
Tianjin branch of China National Offshore Oil Company Ltd., Tianjin 300452, China
Oil and gas production from metamorphic granite rocks have been reported in some locations. However, the study is much less than that of igneous oil fields and sedimentary oil fields, and is mainly concentrated in China (Luo et al. 2004; Meng et al. 2009; Tong et al. 2012; Wang et al. 2018). Previous scholars have conducted a large number of work on the Archean in the study area and have some understanding of the Archean metamorphic rock reservoir. The age of the Archean strata is between 2500
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