Fault-sand combination modes and hydrocarbon accumulation in Binhai fault nose of Qikou Sag, Bohai Bay Basin, East China

ZHOU Lihong,HAN Guomeng,DONG Yueqi,SHI Qianru,MA Jianying,HU Jinnan,REN Shichao,ZHOU Kejia,WANG Jincheng,SI Weiliu

Table 3 Characteristics of reservoir accumulation elements of Binhai fault nose in Qikou Sag.

Location Fault activity Development of oil source fault Reservoir development Source rock thickness/m Hydrocarbon generation capacity Caprocks Trap condi- tion Fault-sand assemblage pattern Oil & gas transmission capacity Oil and gas accumulation mode Formation Thickness/m West part Weak 1 fault; Single main fault hydrocarbon supply Poor 100-500 Weak 2nd member of Dongying 300 Poor trap condition Conse- quent Weak Poor accumulation Lower sub- member of Sha1 250 Middle part Strong 1 fault; Single main fault hydrocarbon supply Sand layers spread exten- sively, about 50 m thick each 800-1 200 Strong 2nd member of Dongying 400 Large lithology- structural trap Conse- quent Strong Single main fault hydrocarbon supply-fault sand consequent matching- multi-layer stereoscopic oil-bearing Lower sub- member of Sha1 300 East part Weak 13 faults; fault system composite hydrocarbon supply Sand layers come in finger shape, about 40 m thick each 800-1 200 Strong 2nd member of Dongying 300 Lithology trap zone in overlapping manner Vertical From strong to weak Fault system compo- site transportation- fault sand vertical matching-banded overlapping oil-bearing Lower sub- member of Sha1 350