摘要
通过在三维地震数据采集、处理及解释过程中应用和改善了多项技术来提高分辨率和成像效果,对松辽盆地北部泉头组—嫩江组大型河流及大型湖泊—三角洲相沉积砂体的空间形态、内部结构及相带展布进行了地震沉积学的研究,从而避免了传统研究手段所导致的地质体空间形态及相带展布主观臆断的不足。研究发现储集层主要是大型曲流河点坝砂体、进积型及退积型三角洲砂体及湖相区内的重力流砂体,认识到进积型三角洲具有典型的高角度朵状及鸟足状河控型特点,前缘相带窄小、平原相带宽阔、水下分流河道不发育,退积型三角洲具有低角度垂柳状湖控型特点,前缘相带宽阔、平原相带窄小、水下分流河道发育。同时在青山口组及嫩江组二、三段水退旋回发现了大规模滑塌扇、浊积扇,在姚家组及嫩江组一段水进旋回发现了大规模浊积水道,这不仅为松辽盆地北部油气勘探开辟了新领域,同时为非常规储层研究及寻找资源潜力指明了方向。
The Quantou-Nenjiang Formations of Songliao Basin belong to the depression period,developed large fluvial facies in Quantou Formation,but developed large lacustrine-delta deposition in Qingshankou,Yaojia and Nenjiang Formations. The reservoir strata are mainly point bar sand body,progradational and retrogradational delta sand body and the gravity flow sand body of lacustrine facies. The traditional work of exploration just focused on 2D seismic data by point-line research method,so there may be some mistakes in understanding spatial form,the interior structure and the distribution of the sand bodies. By the enlargement of the cover area and the improvement of the acquisition accuracy in 3D seismic works,the Seismic Sedimentology is widespread used in North Songliao Basin. With fine depicting of the geologic bodies,we found that the progradational delta has the typical bird foot shape controlled by the high angle fluvial facies,narrow in the delta front,but wide in the delta plain,without underwater distributary channels developed. The retrogradational delta has the weeping willow shape controlled by the low angle laucustrine facies,wide in the delta front,but narrow in the delta plain,developed the underwater distributary channels. And we found large slump fan and turbidite fan in Qingshankou Formation and group 2-3 of Nenjiang Formation. Also,we found large turbidite channel in Yaojia Formation and group 1 of Nenjiang Formation. This study will cover the shortage of the traditional research techniques and refresh the new field of the exploration in North Songliao Basin.
出处
《沉积学报》
CAS
CSCD
北大核心
2014年第6期1153-1161,共9页
Acta Sedimentologica Sinica
关键词
三角洲体系
重力流体系
河流体系
地震沉积学
松辽盆地
delta system
gravity flow system
fluvial facies system
seismic sedimentology
Songliao Basin
