南海北部白云凹陷深水区SQ13.8深水扇砂体识别与分布研究:以SF-5为例
摘要
珠江口盆地白云凹陷在继"白云运动"之后,在13.8 Ma发生了一次大规模的海退事件,海平面下降至陆架坡折带附近,三角洲向盆地方向推进最远,十分有利于深水扇的发育。通过深水陆坡区B6井及陆架边缘多口井的井震标定,结合钻井、测井分析,系统总结出具有厚度较大(20～40 m)、以泥质粉砂岩为主的斜坡扇储层,对应低频、短轴、强振幅的地震反射特征,在负极性显示的地震剖面上,表现为强波谷地震响应。层序地层格架分析认为工区处于SQ13.8"陆架边缘三角洲—沉积过路区—斜坡扇"的沉积环境,并在层序格架的约束下,通过合成地震记录建立井-震关系,对斜坡扇区第5套砂层组(SF-5)进行储层识别与追踪解释,确定SF-5砂层为主体分布在陆架坡折带外侧陆坡区的丘状体,平面形态似帚状或朵叶状,具有斜坡扇的特征,其优质储层主要分布在工区的中部-西部地区,呈NW-SE方向条带状展布。
After the Baiyun Movement(13.8 Ma),Baiyun Sag in the Pearl River Mouth Basin happened a massive regressive event,the sea level regressed near the shelf slope-break zone and the delta propelled furthest towards the basin,which was very beneficial to the development of deep-water fan.By means of the drilling and logging analysis and the well-seismic calibration of B6 well in the deep water area of the continental slope and some wells in the shelf margin,it was concluded that reservoir of slope fan with larger thickness(20 m to 40 m) in argillaceous siltstone,corresponded to the low frequency,short axis and high amplitude in the seismic reflection,and strong wave hollow in the negative polarity display of the seismic profiles.Through the establishment of sequence stratigraphic framework,it was summarized that the main depositional setting of the SQ13.8 was "shelf margin delta-bypass area-slope fan".On the restraint of the stratigraphic framework,through synthetic seismic records to establish the well-seismic relationship,we identified and interpreted SF-5 reservoir in slope fan zone,and determined the SF-5 reservoir mainly distributed in the moundy which is in the flank of continental slope of the shelf slope break zone,its plane distribution looks like a broom and it has feature of the slope fan.The high quality reservoir of SF-5 mainly distributed in the middle and west working areas,was banded in the north west-south east direction.
After the Baiyun Movement(13.8 Ma),Baiyun Sag in the Pearl River Mouth Basin happened a massive regressive event,the sea level regressed near the shelf slope-break zone and the delta propelled furthest towards the basin,which was very beneficial to the development of deep-water fan.By means of the drilling and logging analysis and the well-seismic calibration of B6 well in the deep water area of the continental slope and some wells in the shelf margin,it was concluded that reservoir of slope fan with larger thickness(20 m to 40 m) in argillaceous siltstone,corresponded to the low frequency,short axis and high amplitude in the seismic reflection,and strong wave hollow in the negative polarity display of the seismic profiles.Through the establishment of sequence stratigraphic framework,it was summarized that the main depositional setting of the SQ13.8 was "shelf margin delta-bypass area-slope fan".On the restraint of the stratigraphic framework,through synthetic seismic records to establish the well-seismic relationship,we identified and interpreted SF-5 reservoir in slope fan zone,and determined the SF-5 reservoir mainly distributed in the moundy which is in the flank of continental slope of the shelf slope break zone,its plane distribution looks like a broom and it has feature of the slope fan.The high quality reservoir of SF-5 mainly distributed in the middle and west working areas,was banded in the north west-south east direction.
引文
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[18]王家豪,庞雄,王存武,等.珠江口盆地白云凹陷中央底辟带的发现及识别[J].地球科学——中国地质大学学报,2006,31(2):209-213.
[2]朱伟林,米立军,钟锴,等.油气并举再攀高峰——中国近海2010年勘探回顾及“十二五”勘探展望[J].中国海上油气,2011,23(1):1-6.
[3]贾承造,赵文智,邹才能,等.岩性地层油气藏勘探研究的两项核心技术[J].石油勘探与开发,2004,31(3):3-9.
[4]施和生,柳保军,颜承志,等.珠江口盆地白云—荔湾深水区油气成藏条件与勘探潜力[J].中国海上油气,2010,22(6):369-374.
[5]柳保军,袁立忠,申俊,等.南海北部陆坡古地貌特征与13.8Ma以来珠江深水扇[J].沉积学报,2006,24(4):476-482.
[6]庞雄,陈长民,彭大钧,等.南海珠江深水扇系统的层序地层学研究[J].地学前缘,2007,14(1):220-229.
[7]庞雄,申俊,袁立忠,等.南海珠江深水扇系统及其油气勘探前景[J].石油学报,2006,27(3):11-15.
[8]柳保军,申俊,庞雄,等.珠江口盆地白云凹陷珠海组浅海三角洲沉积特征[J].石油学报,2007,28(2):49-56.
[9]刘震,张功成,吕睿,等.南海北部深水区白云凹陷渐新世晚期多物源充填特征[J].现代地质,2010,24(5):900-909.
[10]龚跃华,杨胜雄,王宏斌,等.南海北部神狐海域天然气水合物成藏特征[J].现代地质,2009,23(2):210-216.
[11]庞雄,陈长民,邵磊,等.白云运动:南海北部渐新统—中新统重大地质事件及其意义[J].地质论评,2007,53(2):145-151.
[12]柳保军,庞雄,颜承志,等.珠江口盆地白云深水区渐新世—中新世陆架坡折带演化及油气勘探意义[J].石油学报,2011,32(2):234-242.
[13]陈广军.合成地震记录制作与标定中的争论及注意的问题[J].西安石油学院学报:自然科学版,2002,17(4):19-23.
[14]Posamentier H W,Allen P,James D P,et al.Forced regres-sions in a sequence stratigraphic framework:concepts,examplesand exploration significance[J].AAPG Bulletin,1992,76:1687-1709.
[15]谢利华,张博,秦成岗,等.陆架坡折盆地强制海退及正常海退沉积——以珠江口盆地珠江组—韩江组为例[J].沉积学报,2009,27(6):1093-1100.
[16]李宏伟,袁士义,朱怡翔,等.河流相地层相分异与沉积物体积分配规律[J].石油与天然气地质,2005,26(3):356-360.
[17]何仕斌,张功成,米立军,等.南海北部大陆边缘盆地深水区储层类型及沉积演化[J].石油学报,2007,28(5):51-56.
[18]王家豪,庞雄,王存武,等.珠江口盆地白云凹陷中央底辟带的发现及识别[J].地球科学——中国地质大学学报,2006,31(2):209-213.
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