Sequence Patterns, Characteristics of Depositional Systems and Model of Reservoirs of Fault Steep Slope Belt of the First Member of Shahejie Formation in Banqiao Sag

Key words: 
• fault steep slope belt /
• depositional system /
• model of reservoir /
• the first member of Shahejie Formation /
• Banqiao Sag

Abstract: Banqiao Sag is the halfgraben rift sag. The steep slop belt developed in the northwest side of Banqiao Sag. The article analyzed the sequence patterns and the characteristics of the firstmember of Shahejie Formation in the area of the fault steep slope belt. The scale of the highstand delta front is smaller than the lowstand delta front, but the incise valley and the river deposition developed in the time of the lowstand. The steep slop belt controlled the distribution of the sand bodies, which developed along the direction of the fault and paralleled the steep belt. The steep slop belt also controlled the growth of the good source rocks. So the sand bodies, the good source rocks and the controlling faults together controlled the development and distribution of reservoirs. According to the results, the article sum up the sequence patterns and the characteristics of depositional systems, at last built the model of the reservoirs in the fault steep slope belt.