鄂尔多斯盆地临兴地区上古生界致密气成藏特征及物理模拟

doi:10.11743/ogg20200408

Abstract

Abstract:

The exploration potential of the Upper Paleozoic tight sandstone gas reservoirs in Linxing area, Ordos Basin is huge, but the accumulation patterns and migration pathways are relatively controversial.Based on the characteristics of structure, sedimentary facies and sand-body distribution, the source-reservoir combination relationship of the Upper Paleozoic in Linxing area can be categorized into three types:in-source-, near-source- and far-source-reservoir combinations.Using the data of rock pyrolysis, thermal maturity measurement, core description, thin-section observation, scanning electron microscopy, petrophysical property analysis, seismic and well logging interpretation, we analyzed the development characteristics of the source rock, reservoir, charging dynamics and faults.The results show that there are three sets of hydrocarbon source rocks in Linxing area, including coal, carbonaceous mudstone and dark mudstone source rocks with Type Ⅲ and Ⅱ₂ kerogens.The source rocks have high abundance of organic matter and are mostly mature to highly mature, thus are large in hydrocarbon generation potential.The reservoir rocks are dominated by feldspar lithic sandstone of moderate maturity, and are characterized by high heterogeneity and multiple pore throat types, including primary intergranular pores, dissolved intergranular pores, dissolved intragranular pores, intercrystalline pores and micro-cracks.The reservoirs mostly have low porosity and low permeability, with an average porosity of 6.81% and an average permeability of 0.61×10^-3 μm², which reflects a typical tight reservoir.Overpressure is common and gas expansion force is the main driving force for gas accumulation of the in-source- and near-source-reservoir combinations.The well-developed faults can serve as the migration pathways for the natural gas vertically charging to the far-source-reservoir combination and can also improve the reservoir quality and strengthen the lateral migration ability of natural gas.Physical simulation experiments were carried out on the established accumulation model, and it was found that reservoir heterogeneity and faults are the main factors affecting the gas-water relationship.The in-source-reservoir combination is the favorable area for hydrocarbon accumulation, and can be selected as the focus of later exploration and development.

Key words: accumulation characteristics, physical simulation, tight gas reservoir, Upper Paleozoic, Linxing area, Ordos Basin

CLC Number:

TE122.3

Dingye Zheng, Xiongqi Pang, Fujie Jiang, Tieshu Liu, Xinhe Shao, Longlong Li, Yuying HuYan, Fangxin Guo. Characteristics and physical simulation of the Upper Paleozoic tight gas accumulation in Linxing area, Ordos Basin[J]. Oil & Gas Geology, 2020, 41(4): 744-754.

Figures/Tables 11

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时间/s	出水量/mL								测压点压力/kPa
时间/s	1	2	3	4	5	6	7	8	①	②	③
0	0	0	0	0	0	0	0	0	-1.15	-0.03	0.02
22	12	5	30	18	27	19	29	微量	7.89	10.38	13.76
40	23	13	60	40	56	41	54	微量	25.52	20.77	28.56
60	25	16	68	49	63	47	66	微量	28.11	24.90	35.67
110	34	27	82	76	85	69	103	微量	36.56	38.74	42.19
300	34	27	100	76	98	69	115	微量	37.62	45.59	42.88

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Characteristics and physical simulation of the Upper Paleozoic tight gas accumulation in Linxing area, Ordos Basin

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