鄂尔多斯盆地东缘上古生界致密储层含气系统压力演化

doi:10.11743/ogg20230618

Abstract

Abstract:

Multiple tight gas reservoirs are well developed in the Upper Paleozoic sequences at the eastern margin of the Ordos Basin. An accurate understanding of the pressure evolution process of gas reservoirs will be of guiding value to gaining more insights into tight gas accumulation and achieving high and stable gas production in this region. In this study， drilling， logging， and core fluid inclusion test data， as well as simulations of burial and thermal evolution histories are integrated to reveal the pressure evolution of the Upper Paleozoic gas-bearing systems at the eastern margin of the Ordos Basin. The results show that reservoirs in the study area exhibit underpressure， slightly underpressure， and normal pressure systems from bottom to top. The homogenization temperature and salinity of fluid inclusions exhibit continuous distributions overall， suggesting a continuous hydrocarbon charging process. The Taiyuan， Shanxi， and Lower Shihezi formations demonstrate a positive correlation between the homogenization temperature and salinity of fluid inclusions， suggesting a rapid hydrocarbon charging process following near-source hydrocarbon generation. In contrast， the Upper Shihezi and Shiqianfeng formations exhibit a negative correlation between the homogenization temperature and salinity due to the long-distance fluid migration and charging， as well as the rebalancing of fluid inclusions in gas reservoirs under the influence of the Zijinshan tectono-thermal event. During the Mid-Cretaceous， the study area experienced the generation of large quantities of hydrocarbons， leading to the anomalously high reservoir pressure ranging from 34.89 ~ 38.26 MPa， followed by a decrease at later stages under the uplifting of strata. For the pressure drop， 50.31 % ~ 57.85 % was caused by the decline in formation temperature， 28.25 % ~ 41.95 % by natural gas swelling-induced gas migration （predominantly in upper strata）， and 0.37 % ~ 0.79 % by pore rebound. The findings of this study systematically reveal the pressure system evolution of the Upper Paleozoic tight gas reservoirs in the Ordos Basin and the origin of the current reservoir pressure formation. These will be of referential value to understanding the enrichment and accumulation patterns of tight gas in the Ordos Basin and the like.

Key words: fluid inclusion, pressure system, tight gas, Upper Paleozoic, Linxing area, Ordos Basin

CLC Number:

TE122.2

Yong LI, Zhitong ZHU, Peng WU, Chenzhou SHEN, Jixian GAO. Pressure evolution of gas-bearing systems in the Upper Paleozoic tight reservoirs at the eastern margin of the Ordos Basin[J]. Oil & Gas Geology, 2023, 44(6): 1568-1581.

Figures/Tables 18

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井名	深度/m	层位	实际声波时差/（μs/ft）	正常压实曲线方程	正常压实声波时差/（μs/ft）
L-1井	1 599.5	上石盒子组	77.75	t_n =-0.000 2h+4.374 1	57.64
L-5井	1 703.5	太原组	67.01	t_n =-0.000 4h+4.509 0	45.95

井名	深度/m	层位	上覆地层压力/MPa	地层静水压力/MPa	实测地层压力/MPa	x值
L-1	1 599.5	上石盒子组	39.97	17.24	12.93	-0.580
L-5	1 703.5	太原组	41.07	18.36	17.43	-0.107

井号	层位	深度/m	实测地层压力/MPa	预测地层压力/MPa	误差/%
L-1	太原组	2 029.09	17.958	17.935	0.13
	太原组	1 980.50	17.193	16.514	3.95
	上石盒子组	1 564.85	12.592	12.251	2.71
	上石盒子组	1 570.71	13.961	12.797	8.34
L-6	下石盒子组	1 600.76	15.928	15.797	0.82
	下石盒子组	1 573.15	15.285	15.712	2.79
	上石盒子组	1 434.40	14.558	14.530	0.19
	上石盒子组	1 402.77	13.275	14.158	6.65
	石千峰组	1 246.96	12.920	13.032	0.87
	石千峰组	1 214.21	12.536	12.790	2.03
L-5	山西组	1 668.06	17.032	16.871	0.95

层位	测点数/个	均一温度/℃	均一盐度/%
石千峰组	1 004	68.90 ~ 191.80	0.35 ~ 22.58
上石盒子组	990	46.20 ~ 197.60	0.18 ~ 23.05
下石盒子组	1 105	34.40 ~ 198.30	0.35 ~ 21.82
山西组	466	73.60 ~ 198.60	0.18 ~ 20.89
太原组	539	100.00 ~ 130.00	0.35 ~ 20.75

层位	捕获温度/℃	捕获温度均值/℃	包裹体形成时平均深度/m	捕获压力范围/MPa	捕获压力均值/MPa	平均捕获压力系数
石千峰组	71.98 ~ 230.25	130.52	2 900.44	23.91 ~ 45.24	34.89	1.12
上石盒子组	73.14 ~ 237.72	133.95	2 976.66	28.15 ~ 46.08	35.80	1.12
下石盒子组	87.95 ~ 238.62	138.09	3 068.66	29.70 ~ 48.00	37.58	1.14
山西组	78.03 ~ 239.00	138.08	3 068.44	27.14 ~ 49.24	38.26	1.16
太原组	79.84 ~ 222.00	135.73	3 016.22	29.88 ~ 46.79	37.40	1.15

Pressure evolution of gas-bearing systems in the Upper Paleozoic tight reservoirs at the eastern margin of the Ordos Basin

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参数	太原组	山西组	下石盒子组	上石盒子组	石千峰组
深度/m	2 051.50	1 974.50	1 831.50	1 708.50	1 408.50
静水压力/MPa	20.10	19.35	17.95	16.74	13.80
抬升前压力/MPa	37.40	38.26	37.58	35.80	34.89
因温度下降的压力/MPa	11.45	12.37	12.47	11.71	11.74
Δp_r/MPa	0.14	0.17	0.08	0.10	0.13
膨胀力/MPa	5.70	6.36	7.07	7.25	9.22

[1]	Weitao WU, Yansong FENG, Shixiang FEI, Yifei WANG, Heyuan WU, Xudong YANG. Enrichment factors and play fairway mapping for tight gas in the 5^th member of the Permian Shiqianfeng Formation， Shenmu gas field， Ordos Basin [J]. Oil & Gas Geology, 2024, 45(3): 739-751.
[2]	Chenglin LIU, Zhengang DING, Liyong FAN, Rui KANG, Sijie HONG, Yuxin ZHU, Jianfa CHEN, Haidong WANG, Nuo XU. Geochemical characteristics and enrichment factors of helium-bearing natural gas in the Ordos Basin [J]. Oil & Gas Geology, 2024, 45(2): 384-392.
[3]	Junyu WAN, Jianhui ZHU, Suping YAO, Yi ZHANG, Chuntang LI, Wei ZHANG, Haijian JIANG, Jie WANG. Geobiological evaluation of hydrocarbon-generating organisms and source rocks in the Ordovician Majiagou Formation， east-central Ordos Basin [J]. Oil & Gas Geology, 2024, 45(2): 393-405.
[4]	LiHua YANG, ChiYang LIU, Lei HUANG, Yijun ZHOU, Yongtao LIU, Yang QIN. Discovery of suspected intrusive rock bodies in Gufengzhuang area， Ordos Basin and its geological significance [J]. Oil & Gas Geology, 2024, 45(1): 142-156.
[5]	Liang SHI, Bojiang FAN, Zhonghou LI, Ziwei YU, Zijin LIN, Xinyang DAI. Migration differentiation of hydrocarbon components in the 7^th member of the Triassic Yanchang Formation， central Ordos Basin [J]. Oil & Gas Geology, 2024, 45(1): 157-168.
[6]	Jiangjun CAO, Jiping WANG, Daofeng ZHANG, Long WANG, Xiaotian LI, Ya LI, Yuanyuan ZHANG, Hui XIA, Zhanhai YU. Effects of diagenetic evolution on gas-bearing properties of deep tight sandstone reservoirs： A case study of reservoirs in the 1^st member of the Permian Shanxi Formation in the Qingyang gas field， southwestern Ordos Basin [J]. Oil & Gas Geology, 2024, 45(1): 169-184.
[7]	Zongquan HU, Ruyue WANG, Jing LU, Dongjun FENG, Yuejiao LIU, Baojian SHEN, Zhongbao LIU, Guanping WANG, Jianhua HE. Storage characteristic comparison of pores between lacustrine shales and their interbeds and differential evolutionary patterns [J]. Oil & Gas Geology, 2023, 44(6): 1393-1404.
[8]	Chenglin LIU, Zhengang DING, Jianfa CHEN, Liyong FAN, Rui KANG, Haidong WANG, Sijie HONG, Anqi TIAN, Xueyong CHEN. Characteristics and helium-generating potential of helium source rocks in the Ordos Basin [J]. Oil & Gas Geology, 2023, 44(6): 1546-1554.
[9]	Jianhui ZENG, Yaxiong ZHANG, Zaizhen ZHANG, Juncheng QIAO, Maoyun WANG, Dongxia CHEN, Jingli YAO, Jingchen DING, Liang XIONG, Yazhou LIU, Weibo ZHAO, Kebo REN. Complex gas-water contacts in tight sandstone gas reservoirs： Distribution pattern and dominant factors controlling their formation and distribution [J]. Oil & Gas Geology, 2023, 44(5): 1067-1083.
[10]	Yueli LIANG, Xiaoming ZHAO, Xi ZHANG, Shuxin LI, Jiawang GE, Zhihong NIE, Tingshan ZHANG, Haihua ZHU. Orbital forced high-resolution sequence boundary identification of marine-continental transitional shale and its geological significance： A case in Shan 2³ sub-member at the eastern margin of Ordos Basin [J]. Oil & Gas Geology, 2023, 44(5): 1231-1242.
[11]	Han LI, Jinhua FU, Hancheng JI, Lei ZHANG, Yuwei SHE, Wei GUAN, Xianghui JING, Hongwei WANG, qian CAO, Gang LIU, Jiayi WEI. Bauxite series in the Upper Paleozoic weathering crusts in the southwestern Ordos Basin： Development and distribution of dominant reservoirs [J]. Oil & Gas Geology, 2023, 44(5): 1243-1255.
[12]	Xiao LI, Peng GUO, Yanzhi HU, Shixiang LI, Weiwei YANG. Experiment and numerical simulation of hydraulic fracturing in lacustrine shale： Taking the Ordos Basin as an example [J]. Oil & Gas Geology, 2023, 44(4): 1009-1019.
[13]	Jiahong GAO, Zhijun JIN, Xinping LIANG, Shixiang LI, Weiwei YANG, Rukai ZHU, Xiaoyu DU, Quanyou LIU, Tong LI, Lin DONG, Peng LI, Wang ZHANG. The impact of volcanism on eutrophication and water column in a freshwater lacustrine basin： A case study of Triassic Chang 7 Member in Ordos Basin [J]. Oil & Gas Geology, 2023, 44(4): 887-898.
[14]	Ziyi WANG, Jinhua FU, Xianyang LIU, Shixiang LI, Changhu ZHANG, Xinping LIANG, Lin DONG. The influence of hydrothermal activities on shale oil reservoirs during the burial period of the Upper Triassic Chang 7 Member， Ordos Basin [J]. Oil & Gas Geology, 2023, 44(4): 899-909.
[15]	Yan ZHOU, Siyi FU, Tao ZHANG, Hongde CHEN, Zhongtang SU, Juntao ZHANG, Chenggong ZHANG, Ziming LIU, Xiaoyu HAN. Tectono-sedimentary evolution， paleo-geographic reconstruction and play fairway delineation of the Lower Paleozoic， Ordos Basin [J]. Oil & Gas Geology, 2023, 44(2): 264-275.

层位	古地层压力/MPa	古地层温度/℃	古压缩因子	现地层压力/MPa	现地层温度/℃	现压缩因子	温度导致的地层压力降低值/MPa
石千峰组	34.89	130.52	1.013 2	12.91	41	0.864 0	11.74
上石盒子组	35.80	133.95	1.020 2	12.52	47	0.872 9	11.71
下石盒子组	37.58	138.09	1.032 5	15.75	52	0.872 4	12.47
山西组	38.26	138.08	1.038 0	16.87	56	0.877 4	12.37
太原组	37.40	135.73	1.031 6	17.22	59	0.881 0	11.45