黄骅坳陷中部潜山地质特征及油气勘探方向

Geological characteristics and hydrocarbon exploration direction in buried-hill, central Huanghua Depression

 王文庆¹ 李岳桐² 卢刚臣¹ 张谦 3 林翠¹ 赵子豪 3

东方地球物理公司研究院大港分院，天津 300280 中国地质大学（武汉）地球科学学院，湖北 武汉 430074

 黄骅坳陷中部潜山具有含油层系多、勘探程度低的特点，利用新三维地震数据体，对中部潜山进行构造落实、圈闭类型及成藏模式研究，明确了该区潜山发育受控于印支—燕山期挤压构造及喜山期盆缘伸展断裂，存在背斜潜山、翘倾断块潜山和走滑隐伏潜山3种类型。背斜潜山主要发育在沿岸走滑带以东，勘探层系为奥陶系；翘倾断块潜山夹持于沿岸与孔西走滑带之间，勘探层系包括二叠系、中生界；走滑隐伏潜山发育在孔西走滑带两侧，勘探层系为二叠系及中生界。结合潜山供烃及内幕结构特点判断，认为中部潜山勘探主攻方向应集中在两大领域：其一是喜山期扭张运动中发育的翘倾断块潜山，紧邻歧口主生油气中心，双源供烃，油气源充沛，重点预探“新生古储型”南大港潜山，突破意义重大；其二是与潜山内幕存在的盲冲断层相关的走滑隐伏潜山，中、新生代经历了断裂改造，储层发育，着重探索“古生古储型”孔西走滑隐伏潜山油气藏，甩开勘探意义大。

 The buried-hill in the middle of Huanghua Depression is characterized by multiple oil-bearing sequences and low-degree exploration. Using new 3D seismic data volume, the structure was implemented, and trap types and reservoir model of the buried-hill were researched, which comes to the conclusion that the development of buried-hill district is controlled by compressional structure of Indosinian-Yanshan period and basin margin extensional fracture in Himalayan period. There are 3 types of buried-hills: anticline, warped fault-block, strike slip concealed buried-hill. Anticline buried-hill is mainly developed east of the coastal strike slip zone, and the exploration layer is Ordovician; the tilted fault-block buried-hill, which is sandwiched between the coastal and the Kongxi strike slip zone, and the exploration layers are Permian and Mesozoic; the strike slip concealed buried-hill is developed on both sides of the Kongxi strike slip zone, and the exploration layers are Permian and Mesozoic; according to the characteristics of hydrocarbon supply and structure of buried-hill, it is considered that the main direction of exploration in central buried-hill should be concentrated on two major fields. One is the warped fault block developed in the transtensional movement of Himalayan period, which is next to the Qikou oil and gas generating center and has dual source hydrocarbon generation, and the oil and gas resources are abundant. It is of great significance to explore the buried-hill of "new source to old reservoir" type in south of Dagang. The other is the strike slip concealed buried-hill related to the thrust fault, which went through fault reconstruction and reservoir development in Mesozoic and Cenozoic. We should focus on the exploration of strike slip buried-hill oil and gas reservoirs, which belong to the "old source to old reservoir" type, and this exploration is very significant.

10.6056/dkyqt201705004