柴达木盆地尖北斜坡基岩储层特征及天然气成藏条件

doi:10.11743/ogg20200207

Abstract

Abstract:

Jianbei slope is one of the key areas for natural gas exploration in the eastern segment of the Altun Piedmont, Qaidam Basin, but the analysis of developing characteristics and gas accumulation conditions of the basement reservoirs in this area is still rarely seen.Based on observation of cores and thin sections, combined with major element analysis, XRD, SEM, MIP(mercury intrusion porosimetry)and log-seismic data analysis, we analyzed the developing characteristics of basement reservoirs and the favorable conditions for natural gas accumulation in Jianbei slope, Qaidam Basin.The results show that the basement reservoirs in the study area are dominated by granodiorite, granite and schist.The reservoirs of weathering crust type are developed there, with the semi-weathering crust reservoirs being the best in porosity and per-meability.The reservoir space is mainly matrix micropores, dissolved pores and cracks, with a reservoir porosity ranging between 2.23% and 3.77% and an average permeability of 0.06mD.So the reservoirs are mainly Type Ⅱ reservoirs of medium permeability.The distribution area of the basement reservoirs is adjacent to the Jurassic hydrocarbon kitchen to the west of Pingdong area.The natural gas generated in the kitchen migrated along the well-developed deep-rooted large faults and unconformities at the bottom of basement; then got effectively sealed by the gypsiferous mudstones deposited under the Paleogene saline lacustrine environment on the basement top; and ultimately got accumulated in the faulted anticline trap formed during the Late Pleistocene, resulting in the formation of weathering crust gas reservoir on the basement top.In all, the research results are of instructional significance to further exploration of basement gas reservoirs in Jianbei slope, Qaidam Basin.

Key words: basement, reservoir, accumulation condition, natural gas, Jianbei slope, Qaidam Basin

CLC Number:

TE122.3

Xiaoqin Jiao, Huapeng Niu, Qingbin Xie, Yongshu Zhang, Junwei Li, Zhixiong Wu, Bo Wang, Xin Li. Characteristics of basement reservoirs and setting for natural gas accumulation in Jianbei slope, Qaidam Basin[J]. Oil & Gas Geology, 2020, 41(2): 305-315.

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样品		孔隙度/ %	渗透率/ 10^-3 μm²	最大连通孔喉半径/ μm	最大进汞饱和度/ %	退汞效率/ %
井名	深度/m	孔隙度/ %	渗透率/ 10^-3 μm²	最大连通孔喉半径/ μm	最大进汞饱和度/ %	退汞效率/ %
尖探1井	4 639.73	2.31	0.04	3.868	66.52	28.1
尖探1井	4 640.33	3.18	0.03	0.758	77.37	23.2
尖探1井	4 640.82	3.57	0.03	0.468	73.61	30.0
尖探1井	4 641.98	4.95	0.03	0.714	73.62	25.9
尖探1井	4 642.95	1.98	0.03	1.267	61.43	20.4
尖探1井	4 644.22	2.43	0.03	1.289	63.49	25.7
尖探1井	4 645.25	4.78	0.03	0.799	57.58	23.9
尖探1井	4 645.93	2.68	0.02	1.148	54.38	17.8
尖探1井	4 646.36	3.52	0.02	3.341	82.33	21.9
尖探1井	4 647.70	2.14	0.01	4.083	76.74	22.9

储层类型	储集空间类型	岩心孔隙度/ %	岩心渗透率/ (10^-3 μm²)	最大连通孔喉半径/ μm	面孔率/%
Ⅰ类	基质微孔为主，溶蚀孔、构造缝次之	> 4	> 1	3~5	> 10
Ⅱ类	溶蚀孔为主，溶蚀缝次之	2~4	0.03~1	1~3	5~10
Ⅲ类	发育溶蚀缝、解理缝，少量溶蚀微孔	< 2	< 0.03	< 1	< 5

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Characteristics of basement reservoirs and setting for natural gas accumulation in Jianbei slope, Qaidam Basin

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