Geologic Characteristics of Reservoir Accumulation in Suganhu Depression in North Margin of Qaidam Basin

Abstract:

Based on the analysis and testing data of rocks, the basic geologic characteristics of Suganhu depression is discussed. It is concluded that the 200m thickness dark mudstone of inshore shallow lake face in the middle–lower Jurassic stratum is the only source rock of this region. It has the characteristics of high abundance of organic matter and in high mature stage. And the type of organic matter is Ⅱ2.The reservoir properties is controlled by the influences of both the sedimentation and the diagenesis and belong to the low porosity and low permeability ones. The mudstone of Upper Jurassic is the local cap, the ones of braided river face and braided river delta face which existed in the up-middle of the middle Jurassic can be qualified as sealing bed between the sand bodies. Paleocene–eocene mudstone is the regional cap rock. The ability of upper Jurassic sealing bed is good because of the low porosity and permeability and high break pressure. The regional cap rock has the characteristics of big thickness and large area. Both the local and regional cap rock had been able to seal the petroleum and gas before the time of hydrocarbon accumulation of middle Jurassic. In general, Mesozoic formed reservoir–cap combination with the features of lower–generation and upper–reservoir, upper–cap.

• Periodical: Advanced Materials Research (Volumes 616-618)
• Pages: 19-25
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.616-618.19
• Online since: December 2012
• Authors: Cheng Zhang, Guang Yang, Yong Shu Zhang
• Keywords: Mesozoic, Northern Margin of Qaidam Basin, Reservoir Geological Feature, Suganhu Depression

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