黄骅坳陷中区古近系东营组沉积特征及有利勘探区带预测
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摘要
综合岩心、钻井、地震等资料,运用层序地层学、现代沉积学的思路和方法,对黄骅坳陷中区古近系东营组的沉积体系特征进行了分析,指出东营组沉积时期处于盆地断—拗转化阶段,主要发育湖泊三角洲和湖泊体系,局部地区发育扇三角洲和浊积体系等。沉积体系的时空分布和演化特征受控于构造背景和层序结构样式的差异,表现为东三段层序(SQEd3)以低位域三角洲和范围扩大的高位域三角洲为主;东二段层序(SQEd2)、东一下段层序(SQEd1x)以板桥次凹等局部地区发育的低位域三角洲和普遍发育的高位域三角洲为主;东一上段层序(SQEd1s)低位域三角洲和高位域三角洲主要分布于歧南次凹和歧北次凹,总体形成了缓坡背景、断控斜坡背景和多级断阶背景下的3类沉积模式。基于上述研究,认为研究区发育5类有利圈闭区:坡折带附近的隐蔽圈闭区、越过凹陷中心的上超尖灭圈闭区、构造—岩性复合圈闭区、低位域和高位域浊积砂体形成的岩性圈闭区、下切谷充填岩性圈闭区,构成了6个有利的勘探区带,这对于指导研究区东营组的油气勘探具有重要意义。
The characteristics of depositional systems of the Dongying Formation in the central area of the Huanghua Depression were analyzed based on analyses of sequence stratigraphy and modern sedimentology combined with core,well and seismic data. The Dongying Formation was formed in the transitional period of tectonic evolution from rifting to sagging stages. Mainly lacustrine deltaic and lacustrine systems were developed. Fan delta and turbidite systems were only distributed sporadically. Time-spatial distribution and evolution of the depositional systems were controlled by tectonic setting and sequence configuration. Three typical depositional models were established and they include gentle slope,fault-controlled steep slope,and multi-level step-fault. In details,lowstand and highstand systems tracts deltas were mainly developed in the SQEd3. Lowstand systems tract delta in local areas such as Banqiao Subsag and highstand systems tract delta with a large range were mainly developed in the SQEd2 and SQEd1x. Lowstand and highstand systems tract deltas were developed in the Qinan and Qibei Subsags in the SQEd1s. Based on the analysis of depositional systems,five types of traps were identified. They are subtle traps near the slope break,onlap pinchout traps across the sag center,structural-lithologic traps,and subtle traps including lowstand systems tract turbidites,highstand systems tract turbidites and incised valley. Six favorable exploration areas were predicted according to the characteristics of traps.
The characteristics of depositional systems of the Dongying Formation in the central area of the Huanghua Depression were analyzed based on analyses of sequence stratigraphy and modern sedimentology combined with core,well and seismic data. The Dongying Formation was formed in the transitional period of tectonic evolution from rifting to sagging stages. Mainly lacustrine deltaic and lacustrine systems were developed. Fan delta and turbidite systems were only distributed sporadically. Time-spatial distribution and evolution of the depositional systems were controlled by tectonic setting and sequence configuration. Three typical depositional models were established and they include gentle slope,fault-controlled steep slope,and multi-level step-fault. In details,lowstand and highstand systems tracts deltas were mainly developed in the SQEd3. Lowstand systems tract delta in local areas such as Banqiao Subsag and highstand systems tract delta with a large range were mainly developed in the SQEd2 and SQEd1x. Lowstand and highstand systems tract deltas were developed in the Qinan and Qibei Subsags in the SQEd1s. Based on the analysis of depositional systems,five types of traps were identified. They are subtle traps near the slope break,onlap pinchout traps across the sag center,structural-lithologic traps,and subtle traps including lowstand systems tract turbidites,highstand systems tract turbidites and incised valley. Six favorable exploration areas were predicted according to the characteristics of traps.
引文
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董艳蕾,朱筱敏,曾洪流,等.2008.黄骅坳陷歧南凹陷古近系沙一层序地震沉积学研究[J].沉积学报,26(2):234-240.
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吴孔友,查明,肖敦清,等.2008.黄骅坳陷埕北断坡不整合特征与油气成藏[J].古地理学报,10(5):545-554.
吴林钢,朱筱敏,范乐元,等.2008.黄骅坳陷北大港构造带沙河街组沉积体系定量研究[J].古地理学报,10(3):241-250.
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赵学平,付立新,张服民,等.1999.大港油田科技丛书—第三系石油地质基础[M].北京:石油工业出版社,1-221.
朱筱敏.2000.层序地层学[M].山东东营:石油大学出版社,1-207.
张淑娟,罗永胜,刘大听.2008.冀中坳陷饶阳凹陷留楚油田古近系东营组沉积微相及油气开发意义[J].古地理学报,10(3):231-239.
钟庆良,潘仁芳,贺保卫.2003.黄骅坳陷白水头—唐家河地区东营组地层地震模拟及响应曲线分析[J].江汉石油学院学报,25(1):50-52.
Cari L J,Stephan A G.2004.Sedimentology and reservoir architectureof a synrift lacustrine delta,southeastern Mongolia[J].Journal ofSedimentary Research,74:770-785.
陈纯芳,郑浚茂,王德发.2001.板桥凹陷沙三段沉积体系与物源分析[J].古地理学报,3(1):55-62.
陈昭年,陈发景,周建生,等.1997.黄骅坳陷中北区和歧口凹陷断裂构造特征及古应力分析[J].现代地质,11(4):471-477.
董艳蕾,朱筱敏,曾洪流,等.2008.黄骅坳陷歧南凹陷古近系沙一层序地震沉积学研究[J].沉积学报,26(2):234-240.
金振奎,刘春慧.2008.黄骅坳陷北大港构造带储集层成岩作用定量研究[J].石油勘探与开发,35(5):581-587.
李绍光,吴涛.1991.中国石油地质志(卷四)—大港油田[M].北京:石油工业出版社,1-436.
李思田,解习农,王华,等.2004.沉积盆地分析基础与应用[M].北京:高等教育出版社,1-410.
廖远涛,王华,王家豪,等.2004.东濮凹陷文东—前梨园地区沙三、沙四段沉积特征和有利储集体预测[J].石油勘探与开发,31(3):75-78.
廖远涛,王振升,肖敦清,等.2008.黄骅坳陷中区古近系层序构成样式分析[J].地球学报,29(2):221-227.
蒲秀刚,吴永平,周建生,等.2007.歧口凹陷岩性地层油气藏特征及勘探潜力[J].石油学报,28(2):35-39.
宋鹍,吴胜和,朱文春,等.2005.黄骅坳陷唐家河油田古近系沙河街组沙一段下部储集层质量研究[J].古地理学报,7(2):275-282.
吴敏,苏一,黎运秀,等.2005.大港高尘头地区东营组小层对比与划分[J].新疆石油地质,26(1):71-72.
王光奇,漆家福,岳云福.2003.歧口凹陷及周缘新生代构造的成因和演化[J].地质科学,38(2):230-240.
吴孔友,查明,肖敦清,等.2008.黄骅坳陷埕北断坡不整合特征与油气成藏[J].古地理学报,10(5):545-554.
吴林钢,朱筱敏,范乐元,等.2008.黄骅坳陷北大港构造带沙河街组沉积体系定量研究[J].古地理学报,10(3):241-250.
许浚远,张凌云,杨东胜,等.1996.歧口凹陷构造演化[J].石油实验地质,18(4):348-355.
严德天,王华,肖敦清,等.2007.黄骅坳陷中部沙三段沉积体系分析[J].石油勘探与开发,34(3):328-334.
赵学平,付立新,张服民,等.1999.大港油田科技丛书—第三系石油地质基础[M].北京:石油工业出版社,1-221.
朱筱敏.2000.层序地层学[M].山东东营:石油大学出版社,1-207.
张淑娟,罗永胜,刘大听.2008.冀中坳陷饶阳凹陷留楚油田古近系东营组沉积微相及油气开发意义[J].古地理学报,10(3):231-239.
钟庆良,潘仁芳,贺保卫.2003.黄骅坳陷白水头—唐家河地区东营组地层地震模拟及响应曲线分析[J].江汉石油学院学报,25(1):50-52.
Cari L J,Stephan A G.2004.Sedimentology and reservoir architectureof a synrift lacustrine delta,southeastern Mongolia[J].Journal ofSedimentary Research,74:770-785.
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