Genesis and Fluid Identification Method of Cretaceous Low-Resistivity Oil Layers in WTK Oilfield

doi:10.7657/XJPG20220217

Abstract

Abstract:

The Cretaceous low-resistivity oil layers in WTK oilfield, South Turgay basin are widely developed and difficult to identify. In this paper, the genetic mechanism of these low-resistivity oil layers was analyzed using core analysis and logging data, and the method for identifying oil/water layers was stuided by combining formation testing data. According to the geological features of the study area, comprehensive research was carried out on internal factors and external factors. The internal factors include the reservoir lithology and clay mineral content during the deposition process, the pore structure characteristics and fluid distribution during diagenesis, and the oil-water differentiation during hydrocarbon accumulation, and the external factors include the accuracy of measurement methods during drilling, etc. The main controlling factors for the low resistivity of the oil layers in the study area are the additional conductivity of clay mineral cations and the conductivity caused by high irreducible water saturation and salinity, and the secondary controlling factors are low structural amplitude and thin oil layers. By analyzing the reservoir conductivity model and based on the model for calculating formation water and irreducible water saturations, the relationship between electrical characteristics and fluid saturation was established, the quantitative evaluation model of low-conductivity oil layers was constructed by stratification, and the lower limit standard for dividing each fluid type was made to realize accurate fluid identification. The practical application shows that the matching degree between the results of logging interpretation and actual production reaches 88.2%, suggesting a good application effect.

Key words: WTK oilfield, Cretaceous, low-resistivity oil layer, genetic mechanism, conductivity model, fluid identification

CLC Number:

TE311

LI Fengling, XU Shipeng, LIU Tao, LU Zhiming, LI Xiang, Aini MAMAT. Genesis and Fluid Identification Method of Cretaceous Low-Resistivity Oil Layers in WTK Oilfield[J]. Xinjiang Petroleum Geology, 2022, 43(2): 241-251.

Figures/Tables 12

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Table 1

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Table 2

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Table 3

Fig. 9.

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井名	深度/m	油层组	孔隙结构类型	渗透率/mD	孔隙度/%	骨架密度/（g·cm^-3）	泥质含量/%	束缚水饱和度/%
WTK203井	1 144.60	M-0-2-A1	单峰	184.9	27.5	2.643	34.2	21.2
WTK203井	1 145.25	M-0-2-A1	单峰	243.7	28.1	2.625	30.5	25.2
WTK203井	1 147.13	M-0-2-A1	双峰	0.2	15.7	2.654	54.3	65.1
WTK203井	1 147.66	M-0-2-A1	双峰	3.3	17.8	2.624	45.4	51.0
WTK203井	1 148.29	M-0-2-A1	双峰	35.7	24.7	2.626	42.5	35.0
WTK203井	1 150.65	M-0-2-A2	双峰	0.9	12.3	2.635	44.6	47.9
WTK203井	1 167.04	M-0-2-A2	双峰	2.1	20.8	2.595	51.3	47.1
WTK203井	1 170.11	M-0-2-A2	双峰	0.3	18.0	2.651	80.3	50.4
WTK203井	1 172.05	M-0-2-B1	双峰	0.1	14.9	2.624	86.8	72.7
WTK203井	1 173.06	M-0-2-B1	双峰	4.2	13.7	2.642	30.5	47.4
WTK203井	1 175.36	M-0-2-B1	单峰	1.8	19.4	2.625	72.2	43.0
WTK335井	934.09	M-0-1-B2	双峰	0.1	9.7	2.665	43.8	63.4
WTK335井	935.60	M-0-1-B2	单峰	7.0	21.4	2.641	49.0	48.9
WTK335井	936.01	M-0-1-B2	单峰	1.3	13.4	2.680	55.5	16.6
WTK335井	936.32	M-0-1-B2	双峰	0.2	10.3	2.675	68.3	74.1
WTK335井	977.67	M-0-2-A2	单峰	366.9	24.6	2.630		27.4
WTK335井	977.74	M-0-2-A2	单峰	298.2	25.6	2.654	26.8	32.6
WTK335井	979.78	M-0-2-A2	双峰	5.2	18.3	2.630	70.3	41.8
WTK335井	981.20	M-0-2-A2	单峰	7.5	22.5	2.654	42.2
WTK335井	981.63	M-0-2-A2	双峰	20.9	23.4	2.648		38.4
WTK335井	982.76	M-0-2-A2	双峰	2.7	12.0	2.636		48.1
WTK335井	982.81	M-0-2-A2	双峰	0.7	6.7	2.683	39.8	54.0
平均			单峰	138.9	22.8	2.644	44.3	30.7
平均			双峰	5.5	15.6	2.642	54.8	52.6