鄂尔多斯盆地西南部地区延长组浊积砂体的地震识别研究
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摘要
鄂尔多斯盆地西南部延长组浊积砂体横向相变快,地震识别困难,严重制约了研究区内浊积岩油气藏的勘探。笔者首先根据研究区浊积砂岩特征、沉积模式建立概念化地质模型,合成地震响应,并用实际地震资料与其进行对比验证,得出地震剖面上三角洲前积反射的前缘倾没端为寻找浊积砂体的有利部位;在此基础上,综合利用地震、钻/测井资料设计地质模型,并进行地震正演模拟,与实际地震资料进行分析对比,总结了研究区浊积砂层组的地震反射特征为丘状反射型和孤立短反射型,为定性解释和预测研究区浊积砂层组的分布提供了依据。
In the Yanchang Formation of the south Ordos Basin,the lateral changes of turbidite sandbody was quick,seismic identification was difficult,the turbidite reservoir exploration was constrained severely.Based on regional characteristics of the turbidite sandbody,and its depositional patterns,a conceptual model was established,seismic response was synthesized and seismic data were used for a comparison,a front pitching end of delta progradation on the seismic profile was established as a beneficial area for searching turbidite sandbody.On the basis stated above,seismic drilling and logging data are integrally used to design a geological model and a forward seismic modeling is performed,the result is contrasted with that of seismic data,the characteristics of seismic reflection of the regional turbidite sand formation are summarized as moundy reflection and isolated short reflection,by which a basis is provided for quantitatively interpretating and predicting the turbidite sand formation in the region.
In the Yanchang Formation of the south Ordos Basin,the lateral changes of turbidite sandbody was quick,seismic identification was difficult,the turbidite reservoir exploration was constrained severely.Based on regional characteristics of the turbidite sandbody,and its depositional patterns,a conceptual model was established,seismic response was synthesized and seismic data were used for a comparison,a front pitching end of delta progradation on the seismic profile was established as a beneficial area for searching turbidite sandbody.On the basis stated above,seismic drilling and logging data are integrally used to design a geological model and a forward seismic modeling is performed,the result is contrasted with that of seismic data,the characteristics of seismic reflection of the regional turbidite sand formation are summarized as moundy reflection and isolated short reflection,by which a basis is provided for quantitatively interpretating and predicting the turbidite sand formation in the region.
引文
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[11]张春雷,王新民,郭彦如.鄂尔多斯盆地姬塬地区延长组地质模型地震正演研究[J].石油天然气学报,2008,30(6):258～259.
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[2]何自新.鄂尔多斯盆地演化与油气[M].北京:石油工业出版社,2006.
[3]杨遂正,金文化,李振宏.鄂尔多斯多旋回叠合盆地形成与演化[J].天然气地球科学,2003,17(4):494～496.
[4]付金华,郭正权,邓秀芹.鄂尔多斯盆地西南地区上三叠统延长组沉积相及石油地质意义[J].古地理学报,2005,7(1):35～38.
[5]赵俊兴,李凤杰,申晓莉,等.鄂尔多斯盆地南部长6和长7油层浊流事件的沉积特征及发育模式[J].石油学报,2008,29(3):390～391.
[6]陈全红,李文厚,郭艳琴,等.鄂尔多斯盆地南部延长组浊积岩体系及油气勘探意义[J].地质学报,2006,80(5):656～658.
[7]傅强,吕苗苗,刘永斗.鄂尔多斯盆地晚三叠世湖盆浊积岩发育特征及地质意义[J].沉积学报,2008,26(2):187～188.
[8]卢龙飞,史基安,蔡进功,等.鄂尔多斯盆地西峰油田三叠系延长组浊流沉积及成因模式[J].地球学报,2006,27(4):30～306.
[9]刘雯林,刘正昕.浊积砂岩透镜体的地震判据和定量解释[J].石油地球物理勘探,1986,21(2):182～183.
[10]姜秀清,沈财余,李红梅.模型技术在地震解释中的应用[J].石油地球物理勘探,2002,37(B09):189～191.
[11]张春雷,王新民,郭彦如.鄂尔多斯盆地姬塬地区延长组地质模型地震正演研究[J].石油天然气学报,2008,30(6):258～259.
[12]陆基孟.地震勘探原理(下册)[M].东营:石油大学出版社,2004.233～236.
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