Reservoir formation conditions and mechanism of Chang 4+5 oil reservoir set in Linzhen area，Ordos Basin
Online published: 2013-10-08
Based on the research of hydrocarbon generation，reservoir conditions，migration，traps and accumulation，this paper systematically analyzed the forming conditions and mechanisms of Chang 4+5 oil reservoir set in Linzhen area．The result shows that the hydrocarbon of Chang 4+5 oil reservoir set is mainly generated from the Chang 7 source rocks，and the reservoir rocks are mostly delta front subfacies sandstone，which is considered to be low porosity and low perm eability reservoir．The dark mud rock，finer sihstone and sihpelite can effectively provide top cap rock for the reservoir．The anomalous pressure form ed by Chang 7 mudstone provides the force for migration．The hydrocarbon form ed by Chang 7 source rocks migrated into Chang 4+5 reservoir through the vertical folding sand bodies and micro—fractures under the high overpressure，vertically migrated into the traps along the delta front sand bodies and form ing reservoir，and form ed nose·shaped structural reservoir,lithologic reservoir and structural—lithologic reservoir,which are influenced by source rocks，sedimentary facies belt,micro-fractures，nose—shaped structure and overpressure．
LEI Yang , WU Wenjing , LIANG Zhenghong , CHEN Bing , LIU Yuanzh . Reservoir formation conditions and mechanism of Chang 4+5 oil reservoir set in Linzhen area，Ordos Basin[J]. Lithologic Reservoirs, 2013 , 25(4) : 11 -16 . DOI: 10.3969/j.issn.1673-8926.2013.04.003
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