Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1299-1309.doi: 10.13278/j.cnki.jjuese.201505104

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Main Controlling Factors of Natural Gas Accumulation in Carbonate in Fifth Member of Ordovician Majiagou Formation, Mid-Eastern Ordos Basin: Take Well Shaan 200 Area as a Study Example

Xu Bo1, Tang Tiezhu2, Li Chen1   

  1. 1. College of Petroleum Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. Department of Gasfiled Development, PetroChina Changqing Oilfield Company, Xi'an 710018, China
  • Received:2014-12-11 Published:2015-09-26

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Abstract:

Jingbian gas field is one of the earliest marine carbonate gas reservoirs discovered in China, and its exploration area has been enlarging. Taking Well Shan 200 and its surrounding area as a study example, we discuss the main controlling factors of natural gas accumulation in Ordovician carbonate reservoir in the mid-eastern Ordos basin, and summarize the results as below: 1)The tectonic evolution of Jingbian gas field is the premise of gas accumulation. It determines the gas-field distribution range and the gas production layer. The location and cutting depth of the ancient valleys have a significant impact on the enrichment degree of Ma 5 gas reservoir. The nose structure is not the main controlling factor. 2)The sedimentary environment is a prerequisite for the formation of favorable reservoir rock. The favorable sedimentary microfacies are intertidal dolomite flat, supratidal dolomite flats, and gypsum-dolomite flats. 3)The constructive diagenesis with corrosion and dolomitization can improve reservoir quality; and multiple-phase corrosion diagenesis plays a role even more important. 4)Fracture is the important factor for natural gas enrichment, but the fracture development degree varies significantly from layer to layer. The efficient allocation of pore, cave, fracture, and ancient valley is controlled by tectonic structure,sedimentary, and diagenesis; therefore, the reservoir quality and gas enrichment of each gas layer segment are quite different.

Key words: carbonate, controlling factors, tectonic evolution, sedimentary environment, diagenesis, Jingbian gasfield

CLC Number: 

  • P618.13

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