Lateral Percolation and Its Effect on Shale Gas Accumulation on the Basis of Complex Tectonic Background

Table 2

Divisions of evaluation units.

Evaluation units	Secondary evaluation units	Buried depth	Structural position
A	A1	2000–3250 m	Slope
	A2	2000–3250 m	Gentle part and near to the large south structure
	A3	3250–4000 m	Gentle part
	A4	3250–4000 m	Slope with small fractures developed
B		<2000 m	Slope and near to outcrops
C		>4000 m	Depression part
D		South side	Large fractures developed and near to outcrops
E		North side	Large fractures developed and near to outcrops