松辽盆地齐家地区高台子油层致密砂岩油成藏机理

doi:10.11743/ogg20210612

Abstract

Abstract:

Tight oil has become an important exploration field in China's petroliferous basins. The study focuses on the tight oil of Gaotaizi reservoir of Qijia area in the Songliao Basin. An array of data obtained from core, thin section, and fluid inclusion observation, geochemical analysis and production test, are applied to analyze the characteristics of the Gaotaizi tight sandstone reservoir, and clarify the accumulation mechanism of tight oil. The results show that the pore space of Gaotaizi reservoir is dominated by residual intergranular pores and feldspathic dissolved pores, with a mean porosity of 9.17% and a mean permeability of 0.45×10^-3 μm². On map view, the porosity of Gaotaizi sandstone reservoir in the northern part of Qijia area is mostly over 12%, while that in the sorth-central area is mostly less than 12%, thus belonging to tight reservoir. The tight reservoirs are mainly of faulted, lithologic-faulted and lithologic types in quasi-continuous distribution and are laterally superimposed and connected and vertically overlapped. They are controlled by sand body distribution, faults and reservoir physical properties, instead of structural highs. The source rocks of the 1^st and 2^nd members of Qingshankou Formation (Qing 1 and Qing 2 members) are of high quality at the peak of oil generation, featuring relatively large thickness and a TOC content of 2.47% and 1.6%, respectively. The tight oil accumulation occurred in 3 episodes of 2 stages, that is the late Nenjiang period and Mingshui period. The faults which do not cut through the Qingshankou Formation, fractures and sand bodies provide pathways for tight oil migration. The burial depth of the top surface of the Gaotaizi reservoir was 800-1 400 m at the end of the Nenjiang Formation deposition, corresponding to a palaeo-porosity of about 21%-15%, and the maximum residual pressure was about 10 MPa, resulting in only conventional reservoir in the center. While its burial depth was 1 600-2 200 m at the end of Mingshui Formation deposition, corresponding to a palaeo-porosity of about 13%-7%, and the maximum residual pressure was over 25 MPa, resulting in tight oil reservoir in wide distribution. The accumulation model of tight oil therein can be concluded as a quasi-continuous type of dual sourced hydrocarbon charging, featuring an lower source rock-upper reservoir assemblage and source-reservoir alternating configuration.

Key words: accumulation period, accumulation mechanism, tight oil in sandstone reservoir, Gaotaizi reservoir, Qijia area, Songliao Basin

CLC Number:

TE122.3

Weitao Wu, Jingzhou Zhao, Qi'an Meng, Tiefeng Lin, Ge Zhang, Jinyou Zhang, Shanghua Si, Yubin Bai. Accumulation mechanism of tight sandstone oil in Gaotaizi reservoir in Qijia area, Songliao Basin[J]. Oil & Gas Geology, 2021, 42(6): 1376-1388.

Figures/Tables 14

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深度/m	1 300	1 400	1 500	1 600	1 700	1 800	1 900	2 000	2 100	2 200
孔隙度/ %	12.92	12.05	11.24	10.48	9.77	9.10	8.46	7.86	7.28	6.74

层位	厚度/m	TOC含量/%	氯仿沥青“A”含量/ %	（S₁+S₂）/（mg·g^-1）	R_o/%	T_max/℃
青一段	60~110	$\frac{{0.81\sim7.94}}{{2.47(38)}}$	$\frac{{0.002 9\sim0.920 7}} {0.372 9(33)}$	$\frac{{0.05\sim66.57}} {13.61(31)}$	$\frac{{0.68\sim1.30}} {0.92(42)}$	$\frac{{436.0\sim518.0}} {446.3(190)}$
青二段（高三小层和高四小层）	70~160	$\frac{{0.52\sim3.66}} {1.60(31)}$	$\frac{{0.001 6\sim 0.856 9}} {0.233 0 (30)}$	$\frac{{0.02\sim54.71}}{{7.04(30)}}$	$\frac{{0.60\sim1.15}} { 0.86(28)}$	$\frac{{435.0\sim465.0}} {444.8 (341)}$

井号	深度/m	油层	第1幕油包裹体均一温度/℃	第1幕盐水包裹体均一温度/℃	第1幕油充注时间/Ma	第2幕油包裹体均一温度/℃	第2幕盐水包裹体均一温度/℃	第2幕油充注时间/Ma	第3幕油包裹体均一温度/℃	第3幕盐水包裹体均一温度/℃	第3幕油充注时间/Ma
QP1	1 952.69	高三小层	65.7 ~ 68.0	85.3 ~ 91.4	77 ~ 75	75.5 ~ 87.4	97.5 ~ 104.5	69 ~ 68	95.7 ~ 101.2	127.2 ~ 133.4	67 ~ 66
QP1	2 071.00	高三小层	67.1 ~ 68.2	88.7 ~ 92.7	78 ~ 77	83.6 ~ 90.2	102.0 ~ 108.9	69 ~ 68	92.4 ~ 99.7	117.5 ~ 128.3	66 ~ 65
J34	2 125.02	高三小层	—	—	—	83.5 ~ 88.1	100.1 ~ 102.4	69 ~ 68	—	—	—
J34	2 135.16	高三小层	68.2	90.6	77	—	—	—	80	111.4	66
L25	2 042.57	高三小层	56.9 ~ 62.3	71.6 ~ 78.4	77 ~ 75	84.2 ~ 89.2	100.4 ~ 105.4	69 ~ 68	—	—	—

参数	取值		数据来源
原油密度/（kg·m^-3）		851	原油物性资料
压缩系数/（10^-3MPa^-1）	原油	2.20	高压物性资料
	地层水	0.44	文献[24]和[39]
	干酪根	1.40	文献[24]和[39]
干酪根密度/（kg·m^-3）		1 200	文献[24]和[39]
泥岩密度（kg·m^-3）		2 600	测井曲线资料
原始TOC含量/ %	青一段	5.41	通过实际恢复
原始TOC含量/ %	青二段	2.40	通过实际恢复
原始氢指数/（mg·g^-1）	青一段	776.12	通过实际恢复
原始氢指数/（mg·g^-1）	青二段	520.45	通过实际恢复
原油体积系数		1.12	高压物性实验测试资料
干酪根转化率		15 % ~ 40 %	盆地模拟获取

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Accumulation mechanism of tight sandstone oil in Gaotaizi reservoir in Qijia area, Songliao Basin

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