准北缘春晖油田三叠系层序控制下圈闭特征研究

近期中石化在准噶尔盆地西北缘山前带哈山地区三叠系获得突破,由于地层超剥关系复杂,且前期受资料限制,圈闭类型及发育特征制约了该区的勘探进展。运用陆相层序地层学方法,借鉴前人研究成果,依据野外露头、地震相、岩心相特征,结合20余口井的钻录测井资料,在哈山地区三叠系内部划分出3个三级层序单元,识别出1期低位域、3期水进域和3期高位域沉积;分析认为体系域的纵向组合制约了储盖组合,从而控制了圈闭类型及有效性;区内三叠系发育构造地层、岩性两类圈闭,构造地层类圈闭主要发育在低位域,受三排北东向断层和尖灭线控制,岩性圈闭发育在高位域及水进域。

Study on the characteristics of trap development controlled by the sequence of Triassic in Chunhui Oilfield,northern margin of Junggar Basin

Recently, Sinopec got breakthrough in Triassic of Hassan area,located in northwestern margin piedmont zone of Junggar basin. Because of the complex relationship between stratigraphic overlap and denudation, and limited by the early data, trap types and the development features limited the exploration progress in this area. Based on the outcrop, seismic facies and core phase characteristics, combined with drilling logging data of more than 20 wells , the author used the continental sequence stratigraphy method, drawing on previous research results, divided the Triassic into 3 three order sequence in Hassan area, identified one period of lowstand, three periods of transgressive system tract and three periods of highstand systems tract. Analysis suggests that system tracts longitudinal combination restricted the reservoir cap combination, so as to control the trap types and effectiveness; structural stratigraphic trap and lithologic trap are the two main types of traps in Triassic of study area. Structural stratigraphic traps are mainly developed in lowstand. Controlled by three rows of NE trending faults and pinchout line, the lithologic traps developed in the highstand systems tract and transgressive system tract.