惠州凹陷新近系珠江组物源方向研究

Research on source direction of Neogene Zhujiang Formation in Huizhou Depression

余烨 2 张昌民 2 张尚锋 2 施和生³ 杜家元 3

长江大学地球科学学院，湖北 荆州 434023 长江大学油气资源与勘探技术教育部重点实验室，湖北 荆州 434023 中海石油（中国）有限公司深圳分公司，广东 广州 510240

School of Geosciences, Yangtze University, Jingzhou 434023, China MOE Key Laboratory of Oil and Gas Resource and Exploration Technology, Yangtze University, Jingzhou 434023, China Shenzhen Branch of CNOOC, Guangzhou 510240, China

应用陆源碎屑轻、重矿物组合特征及相关成分体积分数的平面变化趋势，结合砂体展布及地震反射特征，对珠江口盆地惠州凹陷新近系珠江组下段和上段的物源方向进行了研究。结果表明，珠江组下段存在西北、东北和南部3个物源，其中西北地区和东北地区为远源沉积的产物，而南部地区为近源沉积的产物；随着海平面的上升，珠江组上段南部物源消失，其沉积特征主要受西北和东北2个物源的控制，且西北地区为远源沉积的产物，东北地区为相对近源沉积的产物。

Based on the distribution of sand bodies and the seismic reflection characteristics, the source direction of lower and upper memberｓ of Neogene Zhujiang Formation is researched by analyzing the assemblage characteristics of light and heavy minerals and the plane change trend of debris composition in Huizhou Depression, Pearl River Mouth Basin. The results show that the lower member of Zhujiang Formation has three source regions. The principal sources of detritus in the northwest and northeast area are derived from the distal sedimentation　and the principal sources of detritus in the southern area are derived from proximal sedimentation. With the sea level rising, the southern source region disappears in the upper member of Zhujiang Formation. The sedimentary characteristics are mainly controlled by northwest and northeast source regions. The principal sources of detritus in the northwest area are derived from distal sedimentation and the principal sources of detritus in the northeast area are derived from proximal sedimentation.

10.6056/dkyqt201201004