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+51 sublayer 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.
LI Shuanggui
,
ZHANG Jun
,
YI Hao
,
ZHOU Wen
,
SHAN Yuming
,
YIN Shuai
. 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
.
DOI: 10.3969/j.issn.1673-8926.2014.04.008
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