Genesis and Identification of Low Resistivity of Oil Layers in Badaowan Formation on Southern Slope of Zhongguai Bulge, Junggar Basin

doi:10.7657/XJPG20240505

Abstract

Abstract:

Compared to other low-resistivity oil layers, the low-resistivity oil layers in the Lower Jurassic Badaowan formation on the southern slope of the Zhongguai bulge in the Junggar basin are characterized by early hydrocarbon accumulation, deep burial, large grain size, and low mud content, showing a unique low-resistivity genesis. Based on a comprehensive analysis on the genetic mechanisms of typical low-resistivity oil layers globally, together with the data of drilling, logging, well testing, and core analysis in the study area, the main controlling factors of the low-resistivity oil layers in the Badaowan formation were investigated from various perspectives including tectonics, sedimentation, diagenesis, reservoir characteristics, and hydrocarbon accumulation conditions. It is found that low resistivity of the oil layers in the study area is jointly controlled by macroscopic and microscopic factors. In a macroscopic setting with low tectonic amplitude and weak hydrodynamic sedimentation, low oil-water differentiation degree, high formation water salinity, and low tuff debris content are the main controlling factors for low resistivity, while low saturation of bound water is a secondary controlling factor. Accordingly, a chart illustrating the relationship between formation resistivity and oil/gas indicator coefficient was established, which matches the formation/production testing data in the study area by 92.9%. The study results provide a basis for identifying low-resistivity oil layers in the Badaowan formation on the southern slope of the Zhongguai bulge.

Key words: Junggar basin, Zhongguai bulge, Badaowan formation, low-resistivity oil layer, genetic mechanism, main controlling factor, oil layer identification

CLC Number:

TE133

LI Fengling, FANG Xinxin, ZHANG Zhen, MA Sijie, LIU Rongjun. Genesis and Identification of Low Resistivity of Oil Layers in Badaowan Formation on Southern Slope of Zhongguai Bulge, Junggar Basin[J]. Xinjiang Petroleum Geology, 2024, 45(5): 541-551.

Figures/Tables 10

Table 1.

Fig. 1.

Fig. 2.

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Fig. 4.

Table 2.

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Table 3.

Fig. 7.

References 28

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孔隙分类	孔隙体积/ cm³	有效孔隙度/ %	渗透率/ mD	分选系数	偏态	峰态	变异系数	中值压力/ MPa	中值半径/ μm	排驱压力/ MPa	最大孔喉半径/ μm	退汞效率/ %	孔喉体积比	平均毛细管半径/μm	均质系数
Ⅰ类	2.14	19.34	103.17	3.09	0.18	1.89	0.35	0.64	1.29	0.04	18.53	28.95	2.58	6.34	0.21
Ⅱ类	1.61	14.03	7.31	2.26	-0.20	1.85	0.21	3.57	0.32	0.35	4.66	38.95	1.67	1.25	0.17

井名	试油段/ m	岩性	含油性	对比级别	试油试采结论	电阻率/ （Ω·m）	自然伽马/ API	全烃含量/ %	气测出至组分	全烃增大倍数	油气指示系数
G17井	3 042.0—3 047.0	细砂岩	油浸	15	油层	10.8	52.5	0.032 3~23.192 0	nC₅	71.8	1 077
G171井	3 072.0—3 077.0	中—细砂岩	荧光	10	油层	6.2	57.5	0.266 3~1.360 8	nC₅	5.1	51
GHW1701井		中—细砂岩	荧光	10	油层	8.2	66.0	0.072 7~4.817 3	nC₅	66.3	663
GHW1702井		细砂岩	荧光	10	油层	9.1	57.3	0.165 7~7.168 7	nC₅	43.3	433
GHW1703井		细砂岩	荧光	10	油层	8.6	64.3	0.361 8~5.289 7	nC₅	14.6	146
G191井	3 193.0—3 204.0	细砂岩	荧光	9	油层	14.4	55.1	2.927 3~38.118 1	nC₅	13.0	117
XG1井	3 023.0—3 027.0	细砂岩	荧光	9	油水同层	10.4	57.9	0.123 2~0.841 7	nC₅	6.8	61
J213井	2 995.0—2 997.5	泥质中砂岩	荧光	8	油水同层	14.2	58.7	2.586 1~6.588 6	nC₅	2.5	20
G173井	3 093.0—3 113.5	泥质细砂岩	荧光	8	含油水层	6.5	60.1	0.555 5~4.188 2	nC₅	7.5	60
CP9井	3 124.0—3 126.0	中—细砂岩	油斑	8	水层	4.6	62.6	0.125 6~2.278 5	nC₅	18.1	145
G172井	3 081.0—3 098.0	中—细砂岩	荧光	9	水层	6.0	55.7	0.120 2~3.627 4	nC₅	30.2	272
G192井	3 168.0—3 192.0	细砂岩	油斑	10	水层	7.8	72.1	0.443 7~1.390 4	nC₅	3.1	31
G193井	3 040.0—3 050.0	细砂岩	荧光	8	水层	8.1	51.2	2.278 1~7.016 9	nC₅	3.1	25
G20井	3 381.0—3 383.5	粗砂岩	荧光	10	水层	6.4	48.4	0.132 4~0.724 5	nC₅	5.5	55