Deposition is usually controlled by tectonic movements. The so-called tectonic-sedimentary facies is the sedimental facies that are controlled by various tectonic factors in different tectanic units and evolution stages. In the Jizhong Depression

the factors controlling the deposition include followings: 1. differential vertical movements and their strengths; 2. paleotopography is controlled by synsedimentary structures; 3. paleotopography is controlled by gravitational tectonic

and 4. lake level undulation resulted from the tectonic events. The tectonic unites of the Jizhong Depression are very clear in stripped distribution. As the basement uplifted gradually from west to east

the depo-center moved correspondingly. Accorrding to its characteristics

the depression might be divided into three tectonic belts

i.e. a stable subsident belt; an alternated belt of elevation and subsidence and the last one that subsided first and then 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-hemideep lake facies of lake-depression; 3. submarine fan of steep slopes or/and faulted scarps; 4. gravitative slumping along the steep faults; 5. subequeous fan on gentle slope; 6. delta facies on gentle slope. According to the structure of paleo-1ake basin

the depression might be divided into enclosed fault depression: semi-enclosed fault depression and nonenclosed fault depression. They correspond to three tectonic-sedimentary facies in the Jizhong Depression as stated above. The first two are favourable for hydrocarbon accumulation

but the last one is not.