苏北盆地海安凹陷下白垩统层序地层和沉积相研究
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摘要
运用地震、测井和分析化验等资料,对苏北盆地海安凹陷下白垩统泰州组进行了层序地层和沉积相研究,将泰州组划分为2个三级层序(泰一段构成层序I1和泰二段构成层序I2)和5个体系域,其中,层序I1沉积于盆地断陷期,由于受仪征运动的影响该层序多与下伏浦口组为角度不整合接触,彼此间为典型的层序界面,发育辫状河冲积平原相、辫状河三角洲前缘相、滨—浅湖相和半深湖相沉积;层序I2形成于盆地拗陷期,主要发育辫状河三角洲前缘相、半深湖—深湖相沉积,湖泊沉积范围广,湖相暗色泥岩沉积是盆地主要烃源岩。指出海安凹陷生油层主要发育于沉积层序I2中部湖侵体系域的泥灰岩段,该生油层本身又是良好盖层;而储集层则主要发育在沉积层序Ⅰ1和I2顶部的高水位晚期;海安凹陷中心发育的辫状河三角洲前缘及前三角洲砂体是油气的有利勘探区。
This article studies the sequence stratigraphy and sedimentary facies of the Taizhou Formation in the Hai'an sag in the Subei basin using seismic data,well log data,and assaying data.The Taizhou Formation can be divided into 2 thirdorder sequences and 5 system fields.Sequence I1 consists of the member 1 of the Taizhou Formation,sequence I2 consists of the member 2 of the Taizhou Formation.The sequence I1 was deposited during the faulting period of the basin,during the period when the plain of braided delta,the front of braided delta and shoreshallow lake subfacies were developed.Sequence I2 was deposited during the depression period and the shrinking period of the basin,during this period,the front of braided delta and deep facies were developed.The main source rocks were developed in the middle of the TST sequence I2 which is also good capping formation.The sand body reservoirs of lake 2 delta and fan delta were developed during the later period of the HST sequences I1 and I2,and are the potential areas for oil and gas.
This article studies the sequence stratigraphy and sedimentary facies of the Taizhou Formation in the Hai'an sag in the Subei basin using seismic data,well log data,and assaying data.The Taizhou Formation can be divided into 2 thirdorder sequences and 5 system fields.Sequence I1 consists of the member 1 of the Taizhou Formation,sequence I2 consists of the member 2 of the Taizhou Formation.The sequence I1 was deposited during the faulting period of the basin,during the period when the plain of braided delta,the front of braided delta and shoreshallow lake subfacies were developed.Sequence I2 was deposited during the depression period and the shrinking period of the basin,during this period,the front of braided delta and deep facies were developed.The main source rocks were developed in the middle of the TST sequence I2 which is also good capping formation.The sand body reservoirs of lake 2 delta and fan delta were developed during the later period of the HST sequences I1 and I2,and are the potential areas for oil and gas.
引文
[1]傅强,等.苏北盆地泰州组—下第三系沉积体系研究.内部资料,2004.
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[10]毛凤鸣,张金亮,许正龙.高邮凹陷油气成藏地球化学[M].北京:石油工业出版社,2002:38-40.
[11]周山富.泰州组沼—水生植物孢粉及水盆演变[J].石油与天然气地质,1994,15(2):127-132.
[1]庞雄奇,王英民,柳光第,等.苏北盆地泰州组成藏机理研究.内部报告,2006.
[1]江苏油田石油地质志编写组.江苏石油地质志[M].北京:石油工业出版社,1991:375-394.
[2]胡受权,郭文平,杨风根,等.试论控制断陷湖盆陆相层序发育的影响因素[J].沉积学报,2000,19(2):256-262.
[3]于均民,李红哲,刘震华,等.应用测井资料识别层序地层界面的方法[J].天然气地球科学,2006,17(5):736-738.
[4]朱筱敏,康安,王贵文.陆相坳陷型和断陷型湖盆层序地层样式探讨[J].沉积学报,2003,21(2):283-286.
[5]艳平,任建业,张青林,等.陆相裂陷盆地层序地层构成样式分析——以泌阳凹陷核三上段为例[J].地层学杂志,2005,29(1):71-77.
[6]尹太举,张昌民.层序地层格架内的油气勘探[J].天然气地球科学,2005,16(1):25-30.
[7]党D,赵虹,李文厚,等.安塞油田和延长组长6油层组沉积微相特征[J].天然气地球科学,2004,15(6):597-600.
[8]谢晓军,邓宏文.陆相断陷盆地构造—层序地层研究需注意的几个问题[J].天然气地球科学,2007,18(6):838-842.
[9]钱基,金之钧,张金川,等.苏北盆地盐城凹陷深盆气藏[J].石油与天然气地质,2001,22(1):26-29.
[10]毛凤鸣,张金亮,许正龙.高邮凹陷油气成藏地球化学[M].北京:石油工业出版社,2002:38-40.
[11]周山富.泰州组沼—水生植物孢粉及水盆演变[J].石油与天然气地质,1994,15(2):127-132.
[1]庞雄奇,王英民,柳光第,等.苏北盆地泰州组成藏机理研究.内部报告,2006.
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