Reservoir Characteristics and Controlling Factors of Lower Member of Xiagou Formation in Jiudong Depression
Received date: 2011-10-08
Revised date: 2011-12-27
Online published: 2012-04-10
According to massive drilling data,core samples as well as identification of casting thin sections,electron scanning microscope,X-ray diffraction,and capillary pressure experiments,we discuss the reservoir characteristics in lower member of Xiagou Formation in the Jiudong depression and their controlling factors.The feldspar lithic sandstones and lithic arkose are dominated in the lower member of Xiagou Formation,indicating the low maturity of rock composition and structure.The secondary dissolution pores are the dominant reservoir spaces,and the primary intergranular pores and fratures are secondary.The reservoir is characterized by extra-low porosity and extra-low permeability.The main controlling factors of reservoir development are sedimentary facies and diagenesis.Sedimentary facies determine the distribution of sandbody while diagenesis affects the pore structure and reservoir properties.Compaction and cementation caused great loss of primary pores space and destroyed physical property of reservoir,but dissolution led to development of secondary pores,and increase porosity and permeability of reservoir.
Key words: Jiudong depression; Lower Cretaceous; Deep reservoir; Controlling factors.
LI Wei,CHEN Guo-jun,LV Cheng-fu,DU Gui-chao,LI Chao,YANG Wei . Reservoir Characteristics and Controlling Factors of Lower Member of Xiagou Formation in Jiudong Depression[J]. Natural Gas Geoscience, 2012 , 23(2) : 307 -312 . DOI: 10.11764/j.issn.1672-1926.2012.02.307
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