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Geoscience ›› 2011, Vol. 25 ›› Issue (2): 289-296.

• Water Resource and Environment • Previous Articles     Next Articles

Study on Low Amplitude Structure of Reservoir in Well J Area, Jingbian Gas Field, Ordos Basin

HUANG  Jin-La1,SUN  Wei1,REN  Da-Zhong1,SHI  Diao-Diao2,FENG  Qiang-Han2   

  1. 1.State Key Laboratory of Continental Dynamics, Northwest University, Xian, Shaanxi 710069, China;
    2. Exploration and Development Research Institute, Changqing Oilfield Company, PetroChina, Xian, Shaanxi710021, China
  • Online:2011-04-25 Published:2011-05-13

Abstract:

The present structure features of Jingbian gas field are shown as the regional big westward dipping monocline. It is the Mawu31 thin layer in Mawu segment that was the main gas layer in Ordovician of Lower Paleozoic. Low amplitude folds developed on the top of the thin layer which was extremely gentle, and the local low amplitude structures are closely related with productivity, which are favorable indicators of high-yield areas. Based on the seismic explanation and logging and drilling data, this paper studies the distribution characteristics of low amplitude structure on the top surface of Mawu31 defined as the main gas layer in well J area. Moreover, the structure correlation was analyzed between the top surface of Mawu31 and the top structure of coal No.9 of Benxi Formation as well as marker beds (i.e. K1, K2) of Majiagou Formation. And the combination types of nose structure were summed up, and the relationships between gas enrichment and nose structure were studied. Also, the types of structure trap and combination trap were summarized. In addition, the genetic dynamics of low amplitude structure were analyzed. Thus, this paper gives rise to highly important guiding and practical significances on the well deployment, expanding boundary, digging potential of gas field and dynamic adjustment of horizontal well as well as improvement of drilling success ratio in this well area.

Key words: Jingbian gas field, low amplitude structure, nose structure, combination type, gas enrichment, combination trap, Ordos Basin

CLC Number: