Characteristics of Organic Matter Pores and the Relationship with Current Pressure System of Lower Silurian Longmaxi Shales in Dingshan Field, Southern Sichuan, China

Table 4

Formation pressure and geothermal temperature of Longmaxi shales in Dingshan field.

Well	Depth (m)	Pressure (MPa)	Pressure coefficient	Middle formation temperature (°C)	Geothermal gradient (°C/100 m)
D1	2155.02	22.80	1.01	81	2.83
D2	4398.00	80.80	1.82	145	2.84
D3	2413.90	26.00	1.15	90	2.90
D4	3965.74	58.30	1.5	139	3.00
D5	4018.7	66.10	1.68	140	2.99

Note: the average surface temperature is assumed to be 20°C.