Lacustrine turbidite channels and fans in the Mesozoic Songliao Basin, China
Lacustrine turbidite channels and fans in the Mesozoic Songliao Basin, China
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DOI：
10.1111/j.1365-2117.2009.00442.x
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发表时间：
2010-02
期刊：
影响因子：
3.2
通讯作者：
Feng Zhiqiang;Z. Shun;T. Cross;Feng Zi-hui;Xie Xinong;Zhao Bo;Fu Xiu-li;Wang Chengshan
中科院分区：
文献类型：
--
作者：
Feng Zhiqiang;Z. Shun;T. Cross;Feng Zi-hui;Xie Xinong;Zhao Bo;Fu Xiu-li;Wang Chengshan
松辽盆地是中国东北部的一个大型中生代陆相含油气盆地。通过对高分辨率三维地震资料的分析，在中部凹陷嫩江组湖相泥岩中发现了大规模的湖相浊积河道和扇体系。该体系由三角洲杂岩补给，沿大庆背斜向南延伸。该系统由三条主干航道和四条支流航道组成，最长约71公里。河道形态的变化，特别是分叉和末端进入扇形，与沿古斜坡的坡度变化有关，从0.13°到0.02°不等。地球物理测井和岩心解释表明，河道砂体为含油砂体。河道砂体最宽约600m，平均约300m，最大厚度6m以上，平均约3m，浊积系砂体包裹在富含有机质的烃源岩中，为油气勘探开发提供了新的目标。
The Songliao Basin is a large Mesozoic nonmarine petroliferous basin in northeastern China. Based on an analysis of high‐resolution three‐dimensional seismic data, a large‐scale lacustrine turbidite channel and fan system is identified within the lacustrine mudstone of the Nenjiang Formation in the central depression. The system was fed by a delta complex and extends to the south along the Daqing anticline. This system is composed of three trunk channels and four tributary channels, with a maximum length of about 71 km. Changes in channel patterns, specifically bifurcations and terminations into fans, are associated with gradient changes along the palaeoslope, which vary from 0.13 to 0.02°. Interpretation of geophysical well logs and core indicate that channel sand bodies are oil charged. The widest channel sandstone body is about 600 m with an average around 300 m, and the maximum thickness of sandstone is more than 6 m with an average of about 3 m. The sandstone bodies of the turbidite system, which are encased within organic‐rich source rocks, provide a new target for hydrocarbon exploration and development.