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以断陷湖盆层序地层划分为基础,采用岩心观察、沉积体系分析等方法,重点研究了牛庄洼陷王58地区沙四段上亚段纯上3砂组浊积岩的沉积特征和展布形态,并应用湖平面变化结合构造演化分析了浊积扇的发育特点和成因机制。研究结果表明,牛庄洼陷王58地区沙四段上亚段纯上3砂组发育单一坡折远岸浊积扇,沉积特征表明主要发育辫状水道以及水道间微相;同时运用具有相指示作用的特殊标志物确定了自洼陷东南部的物源在近源处沉积扇三角洲相,在洼陷区沉积浊积扇相;通过对沙四段上亚段纯上4个砂组砂体发育的对比,提出湖平面变化结合构造形态以及物源共同控制了浊积扇的发育和展布特征的观点。物源充分,坡度较大,洼陷较局限是浊积扇发育的有利条件。
Based on the sequence stratigraphic division of the faulted lake basins, the sedimentary characteristics of turbidites in the Upper Triassic Shahejie Formation of the Member 4 of the Member 58 in Wangzhuang area, Niuzhuang Sag are studied emphatically based on core observation and sedimentary system analysis. Distribution pattern of the turbidite fan and the mechanism of turbidite fan development are analyzed based on the change of lake level and tectonic evolution. The results show that the turbidite fan with a single slope is developed in the pure Upper 3-Sand Formation of the Upper Member of Es4 in the Wang 58 area of Niuzhuang Sag. The sedimentary characteristics show that there are mainly braided channels and microfacies between channels. At the same time, The special indicator of the indicator indicates that source rocks from the southeastern part of the Sag have been deposited fan delta facies near the source and turbid fan facies in the depression area. The comparison of body development shows that the change of the lake plane combined with the tectonic forms and the provenance of the source controlled the development and distribution of the turbidite fan. Adequate source, the slope is larger, more limited depression is turbidite fan favorable conditions for development.