鄂尔多斯盆地乌审召地区山_2~3亚段致密气“甜点”控因分析
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摘要
在对苏里格气田东部乌审召地区的构造和气藏进行精细解剖的过程中,发现山_2~3亚段局部存在规模较大的低幅构造圈闭,且对气水分布的控制作用明显。为进一步明确该地区山32亚段天然气富集控制因素,在铸体薄片、物性、压汞、扫描电镜和核磁共振等多种测试分析资料的基础上,对山_2~3亚段储层、圈闭和气藏分布特征进行了探讨。结果表明:研究区山32亚段岩性主要为石英砂岩,孔隙度主体介于5%~10%之间,渗透率主体介于(0.1~10)×10~(-3)μm~2之间,属特低孔、特低渗—超低渗储层,但孔喉连通性较好,渗流能力较强。气藏圈闭类型为构造—岩性圈闭,整体呈似穹窿状。圈闭内气藏分布连续,构造高部位含气,低部位为边底水,构造对山_2~3亚段天然气的聚集与成藏具有明显的控制作用。低幅构造和砂体共同控制了天然气的聚集和保存。
It is found that there is a typical low-amplitude structural trap and it has obvious controlling effect on the distribution of gas and water in Shan_2~3 sub-member during the process of exploration and development in Wushenzhao area in the eastern Sulige Gasfield.In order to further clarify the controlling factors of gas accumulation of Shan_2~3 sub-member in this area,the characteristics of reservoir,trap types and accumulation rule of gas reservoir are discussed on the basis of the analysis of the experimental data,such as thin section,physical property,mercury injection,SEM and NMR.The results showed that the lithology of Shan_2~3 sub-member in the study area is mainly quartz sandstone,the porosity is mainly 5%-10% and the permeability is mainly(0.1-10)×10~(-3)μm~2,which belongs to extra-low porosity and extra-low permeability and even ultra-low permeability reservoirs.The connectivity of pore throats is fairly good and the seepage ability is relatively good,too.The type of gas reservoir trap is a structural-lithologic trap with a shape of quasi-domed.The distribution of gas reservoirs in the trap is continuous,and the high part of the trap is filled with gas and the low part is water.The geological structure does have obvious controlling effect on the accumulation of natural gas in the Shan_2~3 sub-member.The accumulation and preservation of natural gas are controlled by both low-amplitude structures and sand bodies.
It is found that there is a typical low-amplitude structural trap and it has obvious controlling effect on the distribution of gas and water in Shan_2~3 sub-member during the process of exploration and development in Wushenzhao area in the eastern Sulige Gasfield.In order to further clarify the controlling factors of gas accumulation of Shan_2~3 sub-member in this area,the characteristics of reservoir,trap types and accumulation rule of gas reservoir are discussed on the basis of the analysis of the experimental data,such as thin section,physical property,mercury injection,SEM and NMR.The results showed that the lithology of Shan_2~3 sub-member in the study area is mainly quartz sandstone,the porosity is mainly 5%-10% and the permeability is mainly(0.1-10)×10~(-3)μm~2,which belongs to extra-low porosity and extra-low permeability and even ultra-low permeability reservoirs.The connectivity of pore throats is fairly good and the seepage ability is relatively good,too.The type of gas reservoir trap is a structural-lithologic trap with a shape of quasi-domed.The distribution of gas reservoirs in the trap is continuous,and the high part of the trap is filled with gas and the low part is water.The geological structure does have obvious controlling effect on the accumulation of natural gas in the Shan_2~3 sub-member.The accumulation and preservation of natural gas are controlled by both low-amplitude structures and sand bodies.
引文
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[7]Dai Jinxing,Ni Yunyan,Wu Xiaoqi.Tight gas in China and its significance in exploration and exploitation[J].Petroleum Exploration and Development,2012,39(3):257-264.戴金星,倪云燕,吴小奇.中国致密砂岩气及在勘探开发上的重要意义[J].石油勘探与开发,2012,39(3):257-264.
[8]Zou C N,Zhu R K,Liu K Y,et al.Tight gas sandstone reservoirs in China:Characteristics and recognition criteria[J].Journal of Petroleum Science and Engineering,2012,(88/89):82-91.
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[12]Zhao Jingzhou,Li Jun,Cao Qing,et al.Hydrocarbon accumulation patterns of large tight oil and gas fields[J].Oil&Gas Geology,2013,34(5):573-583.赵靖舟,李军,曹青,等.论致密大油气田成藏模式[J].石油与天然气地质,2013,34(5):573-583.
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[19]Zhao Jingzhou,Wu Shaobo,Wu Fuli.The classification and evaluation criterion of low permeability reservoir:An example from Ordos Basin[J].Lithologic Reservoirs,2007,19(3):28-54.赵靖舟,吴少波,武富礼.论低渗透储层的分类与评价标准——以鄂尔多斯盆地为例[J].岩性油气藏,2007,19(3):28-54.
[20]Liu G D,Sun M L,Zhao Z Y,et al.Characteristics and accumulation mechanism of tight sandstone gas reservoirs in the Upper Paleozoic,northern Ordos Basin,China[J].Petroleum Science,2013,10(4):442-449.
[21]Jiang Z X,Li Z,Feng L,et al.Tight sandstone gas accumulation mechanism and development models[J].Petroleum Science,2015,12(4):587-605.
[22]Lin Liangbiao,Lin Hongbin,Hou Mingcai,et al.Geochemistry and accumulation of the Upper Paleozoic natural gas in the Sulige Gasfield,Ordos Basin[J].Sedimentary and Tethyan Geology,2009,29(2):77-82.林良彪,蔺宏斌,侯明才,等.鄂尔多斯盆地苏里格气田上古生界天然气地球化学及成藏特征[J].沉积与特提斯地质,2009,29(2):77-82.
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