鄂尔多斯盆地上古生界天然气成藏特点及开发对策
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摘要
本文依据地质资料、录井解释及测井解释等资料,结合岩心、薄片观察和孔隙度、渗透率测试分析,对鄂尔多斯盆地上古生界早白垩世末烃源岩最大埋深期、晚白垩世以来地层剥蚀期及现今构造定型阶段的天然气运移最大驱动力源区的分布特征进行分析,并对最大驱动力源区及天然气藏的连通关系、烃源岩、储层和隔层的连通关系及上古生界天然气的成藏特点进行研究,在此基础上,对鄂尔多斯盆地上古生界天然气藏的开发对策进行初步探讨。主要取得以下认识：
1.鄂尔多斯盆地上古生界早白垩世末烃源岩最大驱动力源区分布在盆地西部马儿庄—大巴嘴—堵后滩—姬塬一带；晚白垩世以来地层剥蚀期最大驱动力源区分布在盆地西北部铁苏克庙地区及西南部的山城一带；现今构造定型阶段最大驱动力源区分布在盆地西北部铁苏克庙一带。
2.目前发现的天然气藏与盆地在不同地质时期的最大驱动力源区具有良好的连通关系,其连通性主要是通过裂缝实现的。其中,裂缝性泥岩平行层面方向的渗透率平均值为311.74×10-3μm2,裂缝性砂岩的渗透率平均值可达14279.2×10-3μm2。
3.鄂尔多斯盆地上古生界砂岩储气层和相邻的泥岩(烃源岩层、泥岩隔层)具有良好的连通关系,其连通主要是通过裂缝实现的。
4.在天然气藏开发过程中,鄂尔多斯盆地上古生界天然气藏流体的驱动能量在区域上与盆地烃源岩最大驱动力源区有密切关系,储气层和烃源岩、隔层之间可以通过裂缝实现有效的连通。基于上述原因,天然气藏在开发过程中可从气藏以外的区域或与储气层连通的隔层或烃源岩中得到有效的补充。在制定气藏开发措施时,应充分考虑这种特点。
This article is based on geological data, logging and log data interpretation, and core, thin sections and porosity, permeability test and analysis, to analyze the largest depth of source rocks in late early Cretaceous, the denudation since of the late Cretaceous and the biggest driving force distribution of the source area in the current construction phase,to analyze the distribution of natural gas in the basin,to discusses the biggest driving force source and the connectivity relations of natural gas and source rocks, reservoirs and compartments, based on the above analysis,to analyze the characteristics of upper Paleozoic of Ordos Basin gas reservoir, and discuss development strategies. The obtained knowledge are as the follows:
1. The area of late early Cretaceous source rocks of the biggest driving force source in upper Paleozoic of Ordos Basin is maerzhuang-dabazui-duhoutan-jiayuan. The area of the denudation since of the late Cretaceous is Tiesukemiao in the northwest and shancheng in the southwest. The area of the biggest driving force distribution of the source area in the current construction phase is Tiekesumiao in the northwest.
2. The natural gas found currently has a good connection relationship in different geological periods with the greatest driving force source, and the connectivity is mainly achieved through communication cracks. The average shale permeability with fractured parallel to the direction of layers is 311.74×10-3μm2, and the average penetration of fractured sandstone is 14279.2×10-3μm2.
3. The sandstone reservoir and adjacent shale (source rocks, insulation layer) have a certain connectivity relation in Upper Paleozoic of Ordos Basin, and the connectivity relations are achieved through the communication cracks.
4. In the gas reservoir development process, the fluid-driven of upper Paleozoic gas reservoir in Ordos Basin have closely relationship with the greatest driving force source, and through the cracks source rocks, reservoir and the insulation layer can achieve effective connectivity. Based on the above analysis, the connectivity relationships may result in supplement of the region outside the gas reservoir the gas layer in the compartment or the effective source rocks. When working out the gas reservoir development measures, this feature should be fully considered.
1.鄂尔多斯盆地上古生界早白垩世末烃源岩最大驱动力源区分布在盆地西部马儿庄—大巴嘴—堵后滩—姬塬一带；晚白垩世以来地层剥蚀期最大驱动力源区分布在盆地西北部铁苏克庙地区及西南部的山城一带；现今构造定型阶段最大驱动力源区分布在盆地西北部铁苏克庙一带。
2.目前发现的天然气藏与盆地在不同地质时期的最大驱动力源区具有良好的连通关系,其连通性主要是通过裂缝实现的。其中,裂缝性泥岩平行层面方向的渗透率平均值为311.74×10-3μm2,裂缝性砂岩的渗透率平均值可达14279.2×10-3μm2。
3.鄂尔多斯盆地上古生界砂岩储气层和相邻的泥岩(烃源岩层、泥岩隔层)具有良好的连通关系,其连通主要是通过裂缝实现的。
4.在天然气藏开发过程中,鄂尔多斯盆地上古生界天然气藏流体的驱动能量在区域上与盆地烃源岩最大驱动力源区有密切关系,储气层和烃源岩、隔层之间可以通过裂缝实现有效的连通。基于上述原因,天然气藏在开发过程中可从气藏以外的区域或与储气层连通的隔层或烃源岩中得到有效的补充。在制定气藏开发措施时,应充分考虑这种特点。
This article is based on geological data, logging and log data interpretation, and core, thin sections and porosity, permeability test and analysis, to analyze the largest depth of source rocks in late early Cretaceous, the denudation since of the late Cretaceous and the biggest driving force distribution of the source area in the current construction phase,to analyze the distribution of natural gas in the basin,to discusses the biggest driving force source and the connectivity relations of natural gas and source rocks, reservoirs and compartments, based on the above analysis,to analyze the characteristics of upper Paleozoic of Ordos Basin gas reservoir, and discuss development strategies. The obtained knowledge are as the follows:
1. The area of late early Cretaceous source rocks of the biggest driving force source in upper Paleozoic of Ordos Basin is maerzhuang-dabazui-duhoutan-jiayuan. The area of the denudation since of the late Cretaceous is Tiesukemiao in the northwest and shancheng in the southwest. The area of the biggest driving force distribution of the source area in the current construction phase is Tiekesumiao in the northwest.
2. The natural gas found currently has a good connection relationship in different geological periods with the greatest driving force source, and the connectivity is mainly achieved through communication cracks. The average shale permeability with fractured parallel to the direction of layers is 311.74×10-3μm2, and the average penetration of fractured sandstone is 14279.2×10-3μm2.
3. The sandstone reservoir and adjacent shale (source rocks, insulation layer) have a certain connectivity relation in Upper Paleozoic of Ordos Basin, and the connectivity relations are achieved through the communication cracks.
4. In the gas reservoir development process, the fluid-driven of upper Paleozoic gas reservoir in Ordos Basin have closely relationship with the greatest driving force source, and through the cracks source rocks, reservoir and the insulation layer can achieve effective connectivity. Based on the above analysis, the connectivity relationships may result in supplement of the region outside the gas reservoir the gas layer in the compartment or the effective source rocks. When working out the gas reservoir development measures, this feature should be fully considered.
引文
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[12]邓宗淮等.滇黔桂上扬子地区油气盖层条件研究,“七五”国家重点科技攻关项目成果报告,1990
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[15]甘华军,米敬奎,王华等.鄂尔多斯盆地中北部上古生界气田天然气气源与运聚研究[J].石油天然气学报,2007,29(1)：16-23
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[17]郝石生,刘广弟等.油气初次运移的模拟模型[J].石油学报,1994,15(2)
[18]郝石生等.天然气运聚动平衡及其应用[M].北京：石油工业出版社.1994
[19]何更生.油层物理[M].石油工业出版社,1994
[20]何自新,付金华,席胜利.苏里格大气田成藏地质特征[J].石油学报,2003,24(2)：6-12
[21]阂琪,付金华,席胜利等.鄂尔多斯盆地上古生界天然气运移聚集特征[J].石油勘探与开发,2000,27(4)：9-11,26-29
[22]黄志龙等.天然气的运移机理及研究方法,全国第三届油气运移学术讨论会论文摘要汇编.1994
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[24]金爱民,楼章华,朱蓉等.鄂尔多斯盆地上古生界储层现今地下水动力场及其流体特征[J].高校地质学报,2002,8(3)：334-344
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[26]李剑,罗霞,单秀琴等.鄂尔多斯盆地上古生界天然气成藏特征[J].石油勘探与
开发,2005,32(4)：54-59
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[28]李明诚.石油与天然气运移(第二版)[M].石油工业出版社,1994
[29]李明诚.油气运移的现状与发展[J].石油勘探与开发,1994,21(2)：2-3
[30]李明诚.油气运移基础理论与油气勘探[J].地球科学一中国地质大学学报,2004,29(4)：379-883
[31]李明城.石油与天然气运移(第三版)[M].北京：石油工业出版社,2004
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