| 东营凹陷不同超压成因的有效应力特征 |
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| 引用本文： | 王冰洁,何生,宋国奇,王永诗,王学军,郝雪峰,罗胜元.东营凹陷不同超压成因的有效应力特征[J].地质科技情报,2012,31(2):72-79. |
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| 作者姓名： | 王冰洁 何生 宋国奇 王永诗 王学军 郝雪峰 罗胜元 |
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| 作者单位： | 1. 中国地质大学构造与油气资源教育部重点实验室,武汉,430074
2. 中国石化胜利油田分公司,山东东营,257015 |
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| 基金项目： | 国家自然科学基金，国家"十二五"重大科技专项基金，构造与油气资源教育部重点实验室基金 |
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| 摘 要： | 利用实测流体压力(DST)测试结果,结合声波和密度测井资料,对超压段所识别的不均衡压实作用和生烃作用两种超压成因机制下的实测压力和有效应力随深度的变化特征进行了分析,结果表明:①两种不同成因机制下的实测压力和有效应力特征具有明显的差异性,不均衡压实作用在压实过程中导致流体排出受阻,地层流体承担上覆岩层压力形成超压,表现为阻止了地层有效应力增大,因此其实测压力增大段和静岩压力增大趋势大体一致,而有效应力随深度基本保持不变；生油作用在地层正常压实之后形成超压,发育程度不受上覆岩层压力的影响,因此超压的增大在深度上与上覆岩层压力增大不具有一致性,且超压对有效应力的影响要小于不均衡压实作用；②这两种不同的超压成因使得有效应力的变化随着声波速度而出现加载和卸载两种趋势,从而可以用来判断超压成因,利用实测资料计算的有效应力结果说明东营凹陷超压成因机制包括不均衡压实作用和生油作用,但不均衡压实作用形成超压的范围和规模较小,生油作用对深部大规模超压和强超压的形成至关重要.
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| 关 键 词： | 超压特征 实测压力 有效应力 超压成因 东营凹陷 |
Effective Stress Characteristics of Different Overpressured Origins in Dongying Depression of the Bohai Bay Basin, China |
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| WANG Bing-jie
,
HE Sheng
,
SONG Guo-qi
,
WANG Yong-shi
,
WANG Xue-jun
,
HAO Xue-feng
,
LUO Sheng-yuan.Effective Stress Characteristics of Different Overpressured Origins in Dongying Depression of the Bohai Bay Basin, China[J].Geological Science and Technology Information,2012,31(2):72-79. |
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| Authors: | WANG Bing-jie HE Sheng SONG Guo-qi WANG Yong-shi WANG Xue-jun HAO Xue-feng LUO Sheng-yuan |
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| Institution: | 1(1.Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences,Wuhan 430074,China; 2.SINOPEC Shengli Oilfield Company,Dongying Shandong 251015,China) |
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| Abstract: | According to the result of the drilling system test(DST),acoustic logging and density logging,the overpressure and origin including disequilibrium compaction and oil generation were identified.Thus the correlate graph of DST and effective stress follows the depth.These overpressure origin were made and the result follows: ①There is an apparent separation character of disequilibrium compaction and oil generation about DST and effective stress.When vertical loading of sediment increases during burial,rocks generally compact,reducing the pore volume and forcing out formation fluids which undertaking the overburden stress generated the overpressure in the process of disequilibrium compaction.At the same time,the increase of effective stress was held.The result of this process is that the DST has the same trend with the increase of the overburden stress and the effective stress is a constant value following the depth.When the rocks had compacted,overpressure was formed by oil generation.So the degree of overpressure has not related to overburden stress.The increase trend of overpressure in depth is different with the overburden stress.The influence on effective stress is lower than disequilibrium compaction.②The loading curve and unloading curve which can judged the origin of overpressure,was formed in the process of overpressure generation,according the result of effective stress character which was calculated by DST.The origin of overpressure in Dongying Depression is disequilibrium compaction and oil generation.But the area of disequilibrium compaction is smaller.Oil generation has a very significant contribution to forming overpressure,especially the high overpressure. |
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| Keywords: | character of overpressure DST effective stress origin of overpressure Dongying Depression |
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