Lithologic Reservoirs ›› 2016, Vol. 28 ›› Issue (2): 64-71.doi: 10.3969/j.issn.1673-8926.2016.02.009

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Effect of karst paleogeomorphology of Ordovician on gas-water distribution of Ma 5 4 1 in Wushenqi-Zhidan area

Wang Yang 1，2， Li Shutong1， Mou Weiwei 1，2， Shi Yunhe3， Nie Wancai3， Yan Cancan 1，2   

  1.  1. Key Laboratory of Petroleum Resources ， Gansu Province/ Key Laboratory of Petroleum Resources Research ， Institute of Geology and Geophysics ， Chinese Academy of Sciences ， Lanzhou 730000 ， China ； 2. University of Chinese Academy of Sciences ， Beijing 100049 ， China ； 3. Research Institute of Exploration and Development ， PetroChina Changqing Oilfield Company ， Xi ’ an 710032 ， China
  • Online:2016-03-20 Published:2016-03-20

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Abstract:

Karst paleogeomorphology of Ordovician controls gas-water distribution in Wushenqi-Zhidan area of Ordos Basin. Based on the regional tectonic setting and stratigraphic distribution, the compensation thickness impression method （the stratum thickness from the Maoergou limestone to the bottom of Benxi Formation） was used to rebuild the karst paleogeomorphology of Ordovician which includes three types of second-order paleogeomorphology and five types of third-order paleogeomorphology in wushenqi-zhidan area. The three types of second-order paleogeomorphology include karst highland, karst slope and karst basin, and the five types of third-order paleogeomorphology include tableland, shallow depression, monadnock, groove and depression. Overall, the karst highland mainly located in the Wushenqi-Wuqi area, most of the central part of the study area like the east of the Wushenqi-Jianbian-Zhidan belongs to karst slope, and the east of the Hengshan-ansai area pertains to karst basin. Through the analysis of gas reservoir profile and the superposition of karst paleogeomorphology and gas-water distribution, it is found that the water in the study area is mainly distributed in the karst highland, while the gas is mainly distributed in the karst slope or the karst monadnock. In conclusion, although karst highland has a good reservoir space, because of the late tectonic inversion, the re-differentiation and migration of the gas and water lead to relatively enriched groundwater. However, karst slope is located in the transitional zone between karst highland and karst basin and contains a large number of the soluble minerals. It formed well developed reservoir space like pores, vugs and fractures because it has experienced the strong gypsum-dissolving process and the weak cementation. Therefore, it is the most favorable gas accumulating paleogeomorphology unit, followed by karst highland, karst basin worst. In addition, karst monadnock and the contact zone between karst highland and karst slope also have a good natural gas accumulation condition.

Key words: low temperature nitrogen adsorption , fractal dimension , pore structure , specific surface area , lacustrine shale , marine shale

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