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Study on Reservoir Fine Description and Geological Model of Chang6 Oil Formation in Luo 27 Well Area

Author: ZhaoZuo
Tutor: WangJiaHua
School: Xi'an University of Petroleum
Course: Oil and Gas Field Development Project
Keywords: low-permeability reservoir sedimentary microfacies reservoir characteristics reservoir geological modeling
CLC: P618.13
Type: Master's thesis
Year: 2011
Downloads: 122
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Abstract


Luo27 well area is located in Fanxue village and Wangpanshan village, Dingbian. And the oil-bearing formation of which is typical low-permeability lithologic reservoir, the characteristics of Luo27 reservoir include:on one hand, low-permeability reservoir has the characteristics of high-difficulty of exploitation and low natural deliverability; on the other hand, due to late exploitation and development, some basic geological data are not determined, such as sand body distribution, sedimentary microfacies distribution, reservoir evolution and high-quality reservoirs distribution, which limit the development of researched area.In order to solve above problems, based on previous research results, this paper takes Chang6 formation of Luo27 well area as a specific example, researches the structural setting and formation characteristics, and divides two main layers-Chang6 and Chang4+5 of Luo27 well area according to sedimentary cycle and bedthickness. The sedimentary features of target area are thoroughly researched based on single well facies and the profile map and plane graph of sedimentary microfacies. Moreover, the reservoir features are also researched according to reservoir petrologic characteristics and the analysis of physical property and diagenesis. Finally, reservoir geological models such as structural model, lithology model and physical property model are established based on geological characteristics.The research shows that:Chang6 formation of Luo27 well area develops meandering river-delta deposit, mainly delta front deposit. The sedimentary microfacies include underwater distributary channel, mouth bar, channel flank and interdistributary bay, etc. the reservoir porosity is 2%～16%, permeability is (0.2-2)×10-3μm2, which proves low-porosity and low-permeability reservoir. applying reservoir geological model, the distribution of effective reservoir can be directly predicted, which offers a geological basis for precisely evaluating reservoir nature, arrangement of well patterns and exploiting remaining oil.The research results of this paper is important for improving well production and economic benefit of Luo27 and adjacent area, is also suitable to effectively exploit the low-permeability reservoirs in Wangpanshan area.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Oil, natural gas
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