【摘要】 本文以构造-沉积相的概念,划分了冀中坳陷下第三系构造-沉积相的类型,论述了在次级构造因素控制下沉积相带在时间、空间上的分布规律。 冀中坳陷由东向西划分为三个构造-沉积相带。冀中坳陷的14个小凹陷,分属上述三带。由于次级构造因素的控制,文中提出8种不同类型的、各具特色的构造-沉积相。 根据凹陷的结构特征将其分为封闭式、半封闭式和非封闭式三种盆地结构类型。更多还原

【Abstract】 Deposition is usually controlled by tectonic movements. The so-called tec-tonic-sedimentary facies is the sedimental facies that are controlled by varioustectonic factors in different tectanic units and evolution stages. In the JizhongDepression, the factors controlling the deposition include followings: 1. differen-tial vertical movements and their strengths; 2. paleotopography is controlledby synsedimentary structures; 3. paleotopography is controlled by gravitationaltectonic, and 4. lake level undulation resulted from the tectonic events. The tectonic unites of the Jizhong Depression are very clear in stripped dis-tribution. As the basement uplifted gradually from west to east, the depo-centermoved correspondingly. Accorrding to its characteristics, the depression mightbe divided into three tectonic belts, i.e. a stable subsident belt; an alter-nated belt of elevation and subsidence and the last one that subsided first andthen uplifted. Correspondingly, there are three tectonic-sedimentary facies, i.e.,1. stable subsidence lake facies; 2. alternating fluvial-lake facies: and 3. flu-vial facies with first subsiding, soon elevating. On the tectonic unit of depression, there are six types of the tectonic-sedimentary facies: 1.shore-shallow lake facies of lake-depression; 2. deep-hemideeplake facies of lake-depression; 3. submarine fan of steep slopes or/and faultedscarps; 4. gravitative slumping along the steep faults; 5. subequeous fan ongentle slope; 6. delta facies on gentle slope. According to the structure of paleo-1ake basin, the depression might be di-vided into enclosed fault depression: semi-enclosed fault depression and non-enclosed fault depression. They correspond to three tectonic-sedimentary facies inthe Jizhong Depression as stated above. The first two are favourable for hydro-carbon accumulation, but the last one is not.更多还原