Eogenetic karst and its control on reservoirs in the Ordovician Majiagou Formation, eastern Sulige gas field, Ordos Basin, NW China

被引：0
作者：
Xie K. [1 ,2 ]
Tan X. [1 ,2 ]
Feng M. [3 ]
Wang B. [1 ,2 ]
Zhong S. [1 ,2 ]
Yang M. [1 ,2 ]
Nie W. [1 ,4 ]
Qiao Z. [5 ]
Zeng W. [2 ]
机构：
[1] State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu
[2] Department of Key Laboratory of Carbonate Reservoir of CNPC, Southwest Petroleum University, Chengdu
[3] Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi'an
[4] Yihuang Natural Gas Department of PetroChina Changqing Oilfield Company, Xi'an
[5] PetroChina Hangzhou Research Institute of Geology, Hangzhou
来源：
Shiyou Kantan Yu Kaifa/Petroleum Exploration and Development | 2020年 / 47卷 / 06期
关键词：
Dolomite; Eogenetic karst; Majiagou Formation; Ordos Basin; Ordovician; Porous reservoir; Reservoir characteristics; Sulige gas field;
D O I：
10.11698/PED.2020.06.09
中图分类号：
学科分类号：
摘要：
To further ascertain the origin of the Ordovician Majiagou Formation reservoirs in the Ordos Basin, the M54-M51 sub-members of the Ordovician Majiagou Formation in the eastern Sulige gasfield of Ordos Basin were taken as examples to analyze the vertical development characteristics of eogenetic karst and to discover the dissolution mechanism and its control on reservoirs through observation of a large number of cores and thin sections. According to detailed analysis of petrologic characteristics, the reservoir rock types include micritic dolomite, grain dolomite and microbialite which have mainly moldic pore, intergranular (dissolved) pore, and (dissolved) residual framework pore as main reservoir space respectively. The study area developed upward-shallowing sequences, with an exposure surface at the top of a single upward-shallowing sequence. The karst systems under the exposure surface had typical exposure characteristics of early dissolution and filling, indicating these reservoirs were related to the facies-controlled eogenetic karstification. With the increase of karstification intensity, the reservoirs became worse in physical properties. © 2020, The Editorial Board of Petroleum Exploration and Development. All right reserved.
引用
收藏
页码：1159 / 1173
页数：14
相关论文
共 29 条
  • [1] HOU Fanghao, FANG Shaoxian, DONG Zhaoxiong, Et al., The developmental characters of sedimentary environments and lithofacies of Middle Ordovician Majiagou Formation in Ordos Basin, Acta Sedimentologica Sinica, 21, 1, pp. 106-112, (2003)
  • [2] MA Zhenfang, ZHOU Shuxun, The weathered paleocrust on the Ordovician in Ordos Basin and its relationship to gas accumulation, Petroleum Exploration and Development, 26, 5, pp. 21-23, (1999)
  • [3] HE Jiang, FANG Shaoxian, HOU Fanghao, Et al., Vertical zonation of weathered crust ancient karst and reservoir evaluation and prediction: A case study of M55-M51 sub-members of Majiagou Formation in gas fields, central Ordos Basin, NW China, Petroleum Exploration and Development, 40, 5, pp. 534-542, (2013)
  • [4] FANG Shaoxian, HE Jiang, HOU Fanghao, Et al., Reservoirs pore space types and evolution in M55 to M51 sub-members of Majiagou Formation of Middle Ordovician in central gasfield area of Ordos Basin, Acta Petrologica Sinica, 25, 10, pp. 2425-2441, (2009)
  • [5] LIU Xinshe, XIONG Ying, WEN Caixia, Et al., Rock types and sedimentary environment of the Ma51+2 carbonates in Northeastern Ordos Basin, Acta Sedimentologica Sinica, 34, 5, pp. 912-923, (2016)
  • [6] XIAO D, TAN X, ZHANG D, Et al., Discovery of syngenetic and eogenetic karsts in the Middle Ordovician gypsum-bearing dolomites of the eastern Ordos Basin (central China) and their heterogeneous impact on reservoir quality, Marine and Petroleum Geology, 99, pp. 190-207, (2019)
  • [7] XIONG Y, TAN X, ZUO Z, Et al., Middle Ordovician multi-stage penecontemporaneous karstification in North China: Implications for reservoir genesis and sea level fluctuations, Journal of Asian Earth Sciences, 183, (2019)
  • [8] FENG Zengzhao, BAO Zhidong, Lithofacies paleogeography of Majiagou age of Ordovician in Ordos Basin, Acta Sedimentologica Sinica, 17, 1, pp. 1-8, (1999)
  • [9] FU Jinhua, ZHENG Congbin, Evolution between north China sea and Qilian sea of the Ordovician and the characteristics of lithofacies palaeogeography in Ordos Basin, Journal of Palaeogeography, 3, 4, pp. 25-34, (2001)
  • [10] BURNE R V, MOORE L S., Microbialites: Organosedimentary deposits of benthic microbial communities, Palaios, 2, 3, pp. 241-254, (1987)
123