鄂尔多斯盆地陇东地区延长组长 4+5 油层组储层特征及主控因素分析

doi:10.3969/j.issn.1673-8926.2014.04.008

Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (4): 50-56.doi: 10.3969/j.issn.1673-8926.2014.04.008

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Characteristics and main controlling factors of Chang 4+5 oil reservoir set in Longdong area, Ordos Basin

LI Panpan ¹^，²，ZHU Xiaomin¹，ZHU Shifa¹，L IANG Xiaowei³，NIU Xiaobing³，ZHENG Qinghua³

1. College of Geosciences， China University of Petroleum， Beijing 102249， China； 2. CNOOC Energy Technology & Services Limited， Tianjin 300452， China； 3. Research Institute of Exploration and Development， PetroChina Changqing Oilfield Company， Xi’an 710018， China

Online:2014-08-15 Published:2014-08-15

Abstract

Abstract: The Chang 4+5 oil reservoir set of Triassic Yanchang Formation in Longdong area developed delta and lacustrine facies. The reservoir rock types are mainly lithic arkose,feldspathic litharenite and litharenite. The reservoir is typical low porosity and low permeability reservoir with the average porosity of 11.02% and average permeability of 0.37 mD. The main pore types are intergranular pores and intragranular dissolved pores. The pore structure is tiny pore and micro throat with poor sorting and connectivity. In profile, the reservoir properties of Chang 4+5₁sublayer are better than that of Chang 4+5₂ sublayer, and the reservoir properties in the southwest are better than that in the northeast. The clastic rocks experienced compaction, cementation and dissolution. Diagenesis is the basis for the reservoir tightening, while diagenesis is the key factor for forming thigh reservoir. The strong compaction and cementation are the main diagenesis for influencing reservoir properties. The underwater distributary channel and the mouth bar sand body in delta front are favorable reservoirs, and the reservoir properties in the central part of the sand body are the best.

Key words: line-height: 108%, formation conditionsfont-size: 10pt;"> formation conditionsline-height: 108%, ')">font-size: 10pt;">, gypsum mudstone, acoustic waveline-height: 108%, ')">font-size: 10pt;">, wave velocity dispersionline-height: 108%, ')">font-size: 10pt;">, compressional wave slowness time and shear wave slowness timeline-height: 108%, ')">font-size: 10pt;">, quality factor

L I Panpan， ZHU Xiaomin， ZHU Shifa， L IANG Xiaowei， NIU Xiaobing， ZHENG Qinghua. Characteristics and main controlling factors of Chang 4+5 oil reservoir set in Longdong area, Ordos Basin[J].Lithologic Reservoirs, 2014, 26(4): 50-56.

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