松辽盆地南部西斜坡区青一+青二段层序地层格架及其对砂体的控制作用
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摘要
松辽盆地南部西斜坡区青一+青二段砂体较为发育,为了研究其形成机制与分布规律,运用高分辨率层序地层学原理和方法,综合岩心、钻井、测井、地震等资料,确定了研究区层序界面的识别标志。该区青一+青二段发育一个长期基准面旋回,根据该旋回内部发育的转换面,进一步将其划分为3个中期基准面旋回。中期和长期基准面旋回的叠加样式特征明显,中期基准面旋回一般具有对称性特征,上升与下降半旋回均比较发育;长期基准面旋回具有不对称性特征,以发育上升半旋回为主,构成"上升不对称"型旋回结构。结果表明:研究区沉积相类型及砂体的展布受基准面变化的控制较明显,斜坡坡折带上部为三角洲前缘发育区,下部的凹陷区主要为半深湖泥质与滑塌浊积扇体发育区;下降半旋回部分主要发育三角洲前缘砂体,上升半旋回部分主要发育三角洲前缘砂体和浊积体。该研究成果对于研究区的油气勘探,特别是岩性油气藏的勘探,具有一定的借鉴作用。
In order to study the formation mechanism and distribution of the sand bodies developed in Qing 1 and Qing 2 members of Upper Cretaceous in Songliao Basin,with the application of the principle of high resolution sequence stratigraphy,sequence boundary marks were determined and a kind of sequence boundaries of shift surface of deposition were identified according to core,drilling/logging and seismic data.According to the research of sequence boundaries,one long-term base level cycle and three medium-term base level cycles were recognized in the target formations.Based on stacking modes of medium-term to long-term base-level cycles,the stratum mode of medium-term base level cycles is symmetry,but the stratum mode of long-term base level cycles is mainly composed of rising half cycle which composed rising asymmetry cycle configuration.Sedimentary facies and the distribution of sand bodies are mainly controlled by the change of base level.The delta front sand bodies are distributed in the rising and falling stage of medium-term base level cycles,and the turbidity sand bodies are only distributed in the rising stage of medium-term base level cycles.This understanding will be favorable for oil and gas exploration in the study area.
In order to study the formation mechanism and distribution of the sand bodies developed in Qing 1 and Qing 2 members of Upper Cretaceous in Songliao Basin,with the application of the principle of high resolution sequence stratigraphy,sequence boundary marks were determined and a kind of sequence boundaries of shift surface of deposition were identified according to core,drilling/logging and seismic data.According to the research of sequence boundaries,one long-term base level cycle and three medium-term base level cycles were recognized in the target formations.Based on stacking modes of medium-term to long-term base-level cycles,the stratum mode of medium-term base level cycles is symmetry,but the stratum mode of long-term base level cycles is mainly composed of rising half cycle which composed rising asymmetry cycle configuration.Sedimentary facies and the distribution of sand bodies are mainly controlled by the change of base level.The delta front sand bodies are distributed in the rising and falling stage of medium-term base level cycles,and the turbidity sand bodies are only distributed in the rising stage of medium-term base level cycles.This understanding will be favorable for oil and gas exploration in the study area.
引文
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[2]江涛,唐振兴,党立宏,等.松辽盆地南部岩性油藏勘探潜力及技术对策[J].中国石油勘探,2006,11(3):24-29.
[3]张永旺,曾溅辉,邓宏文,等.松辽盆地南部海坨子—大布苏地区青山口组沉积微相研究[J].地层学杂志,2009,33(1):104-112.
[4]赵志魁,张金亮,赵占银,等.松辽盆地南部坳陷湖盆沉积相和储层研究[M].北京:石油工业出版社,2009:16-19.
[5]辛仁臣,王英民.松辽盆地北部青山口—姚家组西部坡折带成因及演化[J].地球科学——中国地质大学学报,2004,29(3):621-624.
[6]宋传春.地震-地质综合研究方法述评[J].岩性油气藏,2010,22(2):133-139.
[7]杨杰,卫平生,李相博.石油地震地质学的基本概念、内容和研究方法[J].岩性油气藏,2010,22(1):1-6.
[8]邓宏文,王红亮,祝永军,等.高分辨率层序地层学:原理及应用[M].北京:地质出版社,2002:16-22.
[9]王洪亮,邓宏文.地层基准面原理在湖相储层预测中的应用[J].石油与天然气地质,1997,18(2):96-102.
[10]邓宏文.美国层序地层研究中的新学派——高分辨率层序地层学[J].石油与天然气地质,1995,16(2):89-97.
[11]郑荣才,王海红,韩永林,等.鄂尔多斯盆地姬塬地区长6段沉积相特征和砂体展布[J].岩性油气藏,2008,20(3):21-26.
[12]王红亮,夏志远,李世臻,等.松辽盆地南部大布苏地区青山口组高频层序沉积微相分析与岩性圈闭预测[J].现代地质,2009,23(5):776-782.
[13]唐振兴,杨光,黄铭志,等.海坨子—大布苏地区青三段砂体沉积机制与岩性油藏[J].岩性油气藏,2007,19(2):50-52.
[14]杜江峰,刘招君,董清水,等.松辽盆地南部西部斜坡区晚白垩世坳陷盆地坡折带研究[J].吉林大学学报:地球科学版,2005,35(2):170-175.
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