Journal
PETROLEUM EXPLORATION AND DEVELOPMENT
Volume 47, Issue 6, Pages 1246-1261Publisher
KEAI PUBLISHING LTD
DOI: 10.1016/S1876-3804(20)60133-7
Keywords
porous reservoir; reservoir characteristics; eogenetic karst; dolomite; Majiagou Formation; Ordovician; Sulige gas field; Ordos Basin
Funding
- China National Science and Technology Major Project [2016ZX05004006-001-002]
- CNPC-Southwest Petroleum University Innovation Consortium Technology Cooperation Project
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To further ascertain the origin of the Ordovician Majiagou Formation reservoirs in the Ordos Basin, the M-5(4) -M-5(1) 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.
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