沾化凹陷西部新生界地层剥蚀量恢复及地质意义
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摘要
利用地震地层综合法和邻近厚度比值法对沾化凹陷西部新生界沙二段和东一段地层进行剥蚀厚度计算和原型盆地恢复,明确了沙二段和东一段地层的剥蚀特征:陈家庄凸起北坡东一段、沙二段剥蚀地层呈东西向窄条状展布。研究区的剥蚀量恢复揭示了渤南洼陷盆地沉积中心迁移特点:沙三段时期在于右旋走滑应力场作用下,形成了2个沉积中心,沙二段时期演化至东营早期,沉积中心分割性增强,地层厚度加大,至东一期变成一个沉积中心。剥蚀量计算和原型盆地分析揭示了研究区沙二段地层剥蚀面与沙一段生油岩的匹配叠置不仅是整个剥蚀线附近大量钻遇良好的油气显示,也是发育优势圈闭的主要控制因素之一。
The denudation depth of the Es2 and Ed1of the west of Dongying Sag are calculated to recover their shapes of the basin by the seismic and formation synthesis method and adjacent depth ratio method, the result show that the denuded layers of Es2 and Ed1of the northern slope of Chenjiazhuang swell were narrow strip distributed in W-E. The recovered denuded layers in the study area revealed features of movement of the depocenter of the Bonan Depression that two depocenters were formed under the right-slip stress field in the stage of the Es3 sedimentation,the depocenters began to broke up and the bed thickness increased from the stage of Es2 to the early stage of Ed,they became one depocenter in the end of early stage of Ed sedimentation. The analyzed result show that superimposition of the exposure level of the layer of Es2 and generating rock of Es1 indicate the hydrocarbon accumulated the whole denudation line nearby, it is the main factor of the development of the outstanding trap.
The denudation depth of the Es2 and Ed1of the west of Dongying Sag are calculated to recover their shapes of the basin by the seismic and formation synthesis method and adjacent depth ratio method, the result show that the denuded layers of Es2 and Ed1of the northern slope of Chenjiazhuang swell were narrow strip distributed in W-E. The recovered denuded layers in the study area revealed features of movement of the depocenter of the Bonan Depression that two depocenters were formed under the right-slip stress field in the stage of the Es3 sedimentation,the depocenters began to broke up and the bed thickness increased from the stage of Es2 to the early stage of Ed,they became one depocenter in the end of early stage of Ed sedimentation. The analyzed result show that superimposition of the exposure level of the layer of Es2 and generating rock of Es1 indicate the hydrocarbon accumulated the whole denudation line nearby, it is the main factor of the development of the outstanding trap.
引文
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[2]袁玉松,郑和荣,涂伟.沉积盆地剥蚀量恢复方法[J].石油实验地质,2008,30(6):636-641.
[3]王毅,金之钧.沉积盆地中恢复地层剥蚀量的新方法[J].地球科学进展,1999,14(5):482-485.
[4]佟彦明,吴冲龙.Ro差值法恢复地层剥蚀量的不合理性[J].天然气工业,2006,26(5):21-23.
[5]卢双舫,刘新颖,王振平等.松辽盆地深层剥蚀量探讨及其意义[J].大庆石油地质与开发,2005,24(1):20-22.
[6]纪友亮,胡光明,吴智平.渤海湾中生代地层剥蚀量及盆地演化[J].天然气工业,2004,24(12):28-31.
[7]王子煜,张明利.东海西湖凹陷新生界主要不整合面地层剥蚀厚度恢复[J].地质论评,2005,51(3):309-318.
[8]黄捍东,罗群,王春英等.柴北缘西部中生界剥蚀厚度恢复及其地质意义[J].石油勘探与开发,2006,33(1):44-48.
[9]王明健,张训华,张运波.临清坳陷东部早—中侏罗世地层剥蚀量恢复与原型盆地[J].特种油气藏,2012,19(6):17-21.
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