石油与天然气地质 ›› 2011, Vol. 32 ›› Issue (4): 615-624.doi: 10.11743/ogg20110416

• 石油与天然气地质 • 上一篇    下一篇

精细层序地层格架与地震沉积学研究——以泌阳凹陷核桃园组为例

  

  • 出版日期:2011-08-28 发布日期:2011-09-26

Seismic sedimentology study of fine sequence stratigraphic framework: a case study of the Hetaoyuan Formation in the Biyang Sag

  • Online:2011-08-28 Published:2011-09-26

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摘要：

摘要：地震沉积学是当今国际沉积学研究热点，是利用地震资料研究沉积岩及其形成过程的一门新兴边缘学科，是进行高频层序和沉积体系研究的有效工具，在薄层砂体勘探和开发方面具有明显效果。根据泌阳凹陷深凹区地震资料质量高、断层少、发育滑塌浊积扇的地质特点，依据地震沉积学和层序地层学基本原理，建立了层序地层格架，将核桃园组划分为5个三级层序和8个四级层序。进而，在高频层序地层格架中，通过90°相位转换、分频处理、地层切片、岩心刻度等工作，开展了地震岩性学和地震地貌学研究，确定了核桃园组多物源供给形成辫状河三角洲-滑塌浊积扇沉积体系，滑塌浊积扇的发育明显受控于三角洲的发育演化，明确了滑塌浊积扇砂体的形态、分布及其与油气关系，指出核桃园组SQ2—SQ4是深凹区岩性油气圈闭的有利勘探层段，三角洲前缘和浊积扇砂体为有利勘探目标。

关键词: 关键词：地震沉积学, 层序地层学, 滑塌浊积扇, 核桃园组, 泌阳凹陷

Abstract:

Abstract: Seismic sedimentology is an emerging interdisciplinary subject that studies sedimentary rocks with seismic data. It is the current hot spot of international sedimentology study, and is an effective tool for mapping highfrequency sequence and depositional systems. It plays an important role in the exploration and production of thin sandstone reservoirs. There are abundant quality seismic data in Biyang Sag which features in underdeveloped faults but highly developed slump turbidite fans. The Hetaoyuan Formation in Biyang Sag is divided into five thirdorder and eight fourthorder sequences on the basis of the fundamental principles of seismic sedimentology and sequence stratigraphy. Seismic lithology study and seismic geomorphology study within highfrequency sequence stratigraphic framework are performed through 90degree phasing convention, frequency division processing, stratal slicing, and core calibration. It is confirmed that multiple provenances contributed to the development of the braided river deltaslump turbidite fan depositional system in the Hetaoyuan Formation, and the development of slump turbidite fans was controlled by the braided river delta. The geometry and distribution of slump turbidite fan sandbodies and their relation with oil and gas are defined. It is pointed out that SQ2, SQ3 and SQ4 are favorable plays of lithologic traps, and the sandbodies of delta front and turbidite fan are favorable exploration targets.