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Evaluation on Reservoir Characteristics and Distribution of Lower Paleozoic Era in Central Tarim Basin

Author: HouGuoQing
Tutor: DengLiZheng
School: Chengdu University of Technology
Course: Oil and gas field development geology
Keywords: Tazhong area Ordovician Reservoir properties Pore ??types Reservoir Evaluation
CLC: P618.13
Type: Master's thesis
Year: 2011
Downloads: 56
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Abstract

Tower in the region of Lower Paleozoic carbonate reservoir has good prospects for exploration, existing research shows that the carbonate reservoir type diversity, complexity and reservoir heterogeneity characteristics of strong a clear understanding of the reservoir distribution, thereby constraining the exploration progress. Therefore, in-depth study of different types of tower carbonate reservoir characteristics, it is necessary to objectively evaluate the reservoir quality and spatial distribution pattern. Absorption on the basis of previous studies, the paper take full advantage of the logging, drilling, logging and testing analysis data, on the Lower Paleozoic carbonate reservoir physical properties in the study area, pore structure characteristics of the reservoir space study, the completion of the evaluation of the reservoir classification and distribution characteristics. Core physical properties towers in Table Ordovician reservoir rock dense low porosity and permeability. The Lianglitag the Yingshan reservoir is relatively developed the the individual layer segment developed Φ gt; 4% of the sample has better reservoir dolomite porosity slightly higher than the limestone. Formation matrix permeability is low, Lianglitag the Yingshan samples have higher permeability samples reflect reservoir developed micro cracks. Tower in Lower Paleozoic carbonate pore types diverse part of the reservoir for the larger pore throat coarse pore structure, most dense rock pore structure characteristics. The study found that the dolomite reservoir in the study area is very important reservoir types, intergranular holes and intergranular melting, corrosion holes and karst seam holes is important and universal development of the infiltration storage space type. BP neural network theory to explain the 19 wells of the study area, porosity, and achieved good results. Reservoir of each well log interpretation porosity values ??of the classification and evaluation. Class Ⅰ, Ⅱ reservoir the Lianglitag, the Yingshan Penglaiba formation and development of a certain thickness, I, class II reservoir accumulated thickness of the stratigraphic thickness of about 0.2-0.3. Reservoir distribution of thin-bedded strata visible monolayer thickness of 10 meters above the reservoir. Lianglitag reef facies reservoir favorable reservoirs in the region, the particles of limestone dissolution pores, the development of corrosion holes, small holes scale dissolution vug reservoir. The reservoir is mainly distributed in the the upper muddy strip limestone and central granular limestone. Tower No. Ⅰ fault phase reservoir development Lianglitag reef favorable zone card the 1 block Lianglitag reservoir not development. Multi-the Yingshan Penglaiba reservoir pore space for intergranular hole solution pores, caverns, karst fissure cave, but the holes smaller, mainly dolomite dissolved pores seam reservoirs. Reservoir distributed Yingshan upper. Yingshan group and Penglaiba, reservoir development area, the top of the Ordovician generally the missing Sangtamu.

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