鄂尔多斯盆地杭锦旗地区十里加汗区带下石盒子组1段岩性圈闭成藏动力及气水分布特征

doi:10.11743/ogg20160206

摘要/Abstract

摘要： 鄂尔多斯盆地杭锦旗地区十里加汗区带发育低渗透砂岩气藏，主力含气层二叠系下石盒子组1段（盒1段）储层非均质性强，局部含水。因此，明确气水赋存状态、分布特征及其主控因素是该区天然气勘探开发的关键。为了分析在浮力作用下致密储层中气水垂向分异条件，对研究区盒1段3类储层开展了压汞和气水相渗实验，并计算了3类储层在气藏条件下的毛细管阻力。结果表明，由于储层非均质性强、连续厚度小，储层中连续气柱浮力小于毛管中值压力，因此盒1段储层不具备气水完全分异的条件。在平缓构造背景下，浮力很难成为大面积低渗储层的充注动力，超压是低渗岩性圈闭的主要成藏动力。通过分析研究区3个岩性圈闭的气层、气水同层及水层的含气饱和度及毛细管压力曲线的差异性，反推了3个岩性圈闭成藏动力。西部的独贵加汗圈闭成藏动力最大，定义为“强动力圈闭”，东部的苏布尔嘎圈闭成藏动力最小，定义为“弱动力圈闭”。在圈闭成藏动力的研究基础上，根据气层与水层在致密非均质性储层中的赋存状态与叠置类型，将3个圈闭中的气、水层分为6种模式。通过分析不同圈闭成藏条件、圈闭动力与气水分布的差异，认为生烃强度和圈闭封闭性是圈闭成藏动力主控因素，圈闭动力和储层非均质性展布共同控制气水分布。

关键词: 气水分布, 毛细管阻力, 成藏动力, 岩性圈闭, 杭锦旗地区, 鄂尔多斯盆地

Abstract: Low-permeability sandstone gas reservoir is the main reservoir type in Shilijiahan zone of Hangjinqi area, Ordos Basin.The 1^st Member of Xiashihezi Formation, which is the major gas bearing reservoir, is characterized by strong heterogeneity and locally complex gas-water contact.Making clear of the occurrence, distribution characteristics and main controlling factors of gas and water is the key to explore and develop gas reservoirs in Shilijiahan zone.In order to analyze the vertical water-gas differentiation under the control of buoyancy in tight reservoir, the capillary resistance in three types of reservoirs were calculated on the basis of mercury injection experiment and gas-water relative flow experiment.The results show that there is no sign of water -gas differentiation in the 1^st Member of Xiashihezi Formation because the buoyancy of continuous gas column in the reservoir is less than the mean capillary pressure due to the strong reservoir heterogeneity and the small continuous thickness.With a gentle tectonic setting, buoyancy can hardly be the charging force of low permeability reservoir with a large area.Instead, overpressure is the main reservoir-forming dynamics.Reservoir-forming dynamics of three lithologic traps in the study area are deduced by analyzing the gas saturation and differences of capillary pressure curves of gas, gas-water and water reservoirs.Duguijiahan trap which is located in the western part of the study area is defined as a strong dynamic trap because of its strongest reservoir-forming energy, while Subuerga trap which is located in the eastern part is defined as a weak dynamic trap because of the minimum reservoir-forming dynamics.Based on the study of reservoir-forming dynamics, six modes of water and gas layer are recognized in the three traps according to the occurrence and overlapping patterns of gas and water layers.After analyzing the differences of geological conditions, trap dynamics and water-gas differentiation, it is suggested that hydrocarbon generation intensity and trap sealing condition are the main controlling factors of reservoir-forming dynamics.Trap dynamics and reservoir heterogeneity conjointly control the distribution of gas and water.

Key words: gas-water distribution, capillary resistance, reservoir-forming dynamic, lithologic trap, Hangjinqi area, Ordos Basin

中图分类号:

TE122.3

张威,李良,贾会冲. 鄂尔多斯盆地杭锦旗地区十里加汗区带下石盒子组1段岩性圈闭成藏动力及气水分布特征[J]. 石油与天然气地质, 2016, 37(2): 189-196. doi: 10.11743/ogg20160206 Zhang Wei,Li Liang,Jia Huichong. Reservoir-forming dynamics and gas-water distribution characteristics of lithologic traps in the 1^st Member of Xiashihezi Formation in the Shilijiahan zone,Hangjinqi area,Ordos Basin[J]. Oil & Gas Geology, 2016, 37(2): 189-196. doi: 10.11743/ogg20160206

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