低孔渗砂岩石油充注临界条件实验--以西峰油田为例

doi:10.7623/syxb201206010

石油学报 ›› 2012, Vol. 33 ›› Issue (6): 996-1002.DOI: 10.7623/syxb201206010

低孔渗砂岩石油充注临界条件实验--以西峰油田为例

刘　震 1 　刘静静 1 　王　伟 1 　潘高峰 1　王　菁 1 　郭彦如 2 赵江青 3

1.中国石油大学油气资源与探测国家重点实验室北京 102249;2.中国石油勘探开发研究院北京 100083; 3.北京康普瑞基石油工程技术有限公司北京 102200

收稿日期:2012-06-16 修回日期:2012-09-30 出版日期:2012-11-25 发布日期:2012-12-07
通讯作者: 刘震
作者简介:刘震，男，1963年2月生，1990年获石油大学(北京)博士学位，现为中国石油大学(北京)教授、博士生导师，主要从事石油地质学教学与研究工作。
基金资助:
国家重大科技专项“岩性地层油气藏成藏规律、关键技术及目标评价”(2011ZX05001-001)资助。

Experimental analyses on critical conditions of oil charge for low-permeability sandstones: a case study of Xifeng oilfield, Ordos Basin

LIU Zhen 1 　LIU Jingjing 1　 WANG Wei 1 　PAN Gaofeng 1 　WANG Jing 1 　GUO Yanru 2 　ZHAO Jiangqing 3

Received:2012-06-16 Revised:2012-09-30 Online:2012-11-25 Published:2012-12-07

摘要/Abstract

摘要：

低孔渗砂岩体油藏在中国油气资源勘探中具有十分重要的地位，但不是所有砂岩体都能成藏，只有达到成藏临界条件的砂岩体才能成藏。现今低孔渗砂岩体物性及流体动力条件不能反映成藏期物性和动力条件，因此，研究成藏临界条件具有非常重要的意义。砂岩样品双轴承压充注实验模拟地层条件下石油充注临界条件，证实了石油充注受临界物性和临界注入压差双重控制。首先，通过测定不同物性样品在不同围压和轴压下的临界注入压差，确定出研究区延长组8段（简称长8段）储层临界孔隙度约为10%，低于该临界值则无论流体压差多高均难以使石油注入砂岩样品。其次，编制多样品临界注入压差随埋深变化曲线，发现物性与临界注入压差具有相互耦合关系。最后，建立了石油充注物性-临界注入压差成藏解释图版，成藏期孔隙度大于10%为有效储层，否则为无效储层。并以研究区典型井为例，较好地解释了长8段砂岩体的成藏过程，该解释图版可作为钻前成藏预测的新方法。

关键词: 低孔渗砂岩, 储层临界物性, 临界注入压力, 临界成藏解释图版, 西峰油田

Abstract:

Low-permeability sandstone reservoirs have been a very important position in petroleum exploration in China. Exploration practice shows that not all of the sandstones but only those with critical conditions of hydrocarbon accumulation can form a reservoir. The present accumulation and dynaflow conditions, including physical properties of sandstones with low-permeability, can not reflect the conditions of the hydrocarbon accumulation period. Therefore, it is great importance to study the critical conditions of hydrocarbon accumulation. Through a biaxial-pressure simulation experiment on the critical conditions of oil charge in strata, it was proved that oil charge is controlled by the critical physical properties and the difference in the critical charging pressure. Through measurements of the difference in the critical charging pressure of different objects under conditions of different confining pressures and axial pressures, we determined the minimum physical properties of oil charge. The critical porosity of reservoirs is about 10% for Member 8 of Yanchang Formation in Xifeng oilfield, Ordos Basin, below which no matter how big the charging differential pressure is, oil can not be charged into sandstone samples. Varying curves of the difference in the critical charging pressure with burial depths for various samples were compiled, and a coupling correlation between physical properties and the difference in the critical charging pressure was found with various characteristics, such as the greater the depth for the same sandstone, the greater the critical charging pressure is; the better properties of a sandstone with the same depth, the smaller the critical charging pressure is; with increasing depth, the variation trend of the critical charging pressure for different sandstone samples is similar. Finally, an interpretation plate for hydrocarbon accumulation in low-permeability sandstones controlled by oil charging properties and the difference in the critical charging pressure was established. Sandstones with below or above 10% porosity in the hydrocarbon accumulation period should become an effective or ineffective reservoir, respectively. The plate well explains the reservoir forming process in sandstones of Member 8 of Yanchang Formation, thus the interpretation plate can be regarded as a new approach to predict reservoirs before drilling.

Key words: low-permeability sandstone, critical physical property of reservoir, critical injection pressure, interpretation plate of critical accumulation, Xifeng oilfield

刘　震刘静静王　伟潘高峰王　菁郭彦如. 低孔渗砂岩石油充注临界条件实验--以西峰油田为例[J]. 石油学报, 2012, 33(6): 996-1002.

LIU Zhen LIU Jingjing WANG Wei PAN Gaofeng WANG Jing GUO Yanru. Experimental analyses on critical conditions of oil charge for low-permeability sandstones: a case study of Xifeng oilfield, Ordos Basin[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(6): 996-1002.

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低孔渗砂岩石油充注临界条件实验--以西峰油田为例

Experimental analyses on critical conditions of oil charge for low-permeability sandstones: a case study of Xifeng oilfield, Ordos Basin

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