试论松辽大型陆相湖盆水进三角洲沉积相

AN APPROACH TO THE SEDIMENTARY FACIES OF THE LARGE LACUSTRINE BASIN WATER-TRANSGRESSION DELTA IN SONGLIAO

蔺毓秀

Lin Yuxiu

石油工业部大庆石油科学研究设计院

Research and Planning Institute of Daqing Oilfield, Ministry of Petroleum Industry

松辽盆地是我国东部陆相大型含油盆地,主要由上侏罗统及白垩系组成,盆地经历了断陷期(晚侏罗世)—拗陷期(早白垩世)—萎缩期(晚白垩世—第三纪)三个发展阶段。盆地内已经发现的含油气层主要集中在下白垩统的拗陷期的沉积层内,包括泉四段(扶余油层)、青山口组(高台子油层)、姚家组(萨尔图、葡萄花油层)、嫩江组(黑帝庙油层),其中主要生产层为萨尔图、葡萄花油层(表1)。青山口组、姚家组沉积时期,在盆地北、西、东三个方向发育有四个河湖三角洲沉积体系,自边缘向中央拗陷深湖区延展,其中以北安—杏树岗三角洲为最大,面积达4.4万平方公里;保康三角洲次之;英台三角洲、齐齐哈尔三角洲更次之。

This article discusses the sedim entary features of the delta of the Salatu and Putaohua pays, exemplifying by the Bei'an-Xingshugang Delta with the most plentiful informations available. It is pointed out that the delta in the Putaohua pay in K1y1 is a lacustrine water-transgression delta, whereas that in K1y1-2 and K1y3 is one with a lacustrine water-transgressive background, and the sand bodies in Sa0 and SaI formations are of turbidity deposits. Patterns of both facies and the sand bodies are also covered.

https://doi.org/10.11781/sysydz198304265