( 1) ; 6 5 [ 3 ] S1 S2 1 Fig. 1 Seismic sequence prof ile framework of Wuliyasitai Sag S1 () ( 2) S2 ( ) Ο 2 S1 Fig. 2 Sedimentary fa

27 3 2006 5 ACTA PETROL EI SIN ICA Vol. 27 No. 3 May 2006 : 0253Ο2697 (2006) 03Ο0027Ο05 1 2 2 2 (11 610059 ; 21 062552) : 2 ; : ; ;; ;; : TE1111 3 : A Forming pattern and distribution features of hydrocarbon reservoir in Wul iyasitai Sag of Erlian Basin Yi Shiwei 1 2 Wang Yuanjie 2 Qian Zheng 2 (1. Cheng du Universit y of Technology Cheng du 610059 China; 2. Research I nstitute of Ex ploration and Development Pet rochi na H uabei Oil f iel d Com pany Renqi u 062552 China) Abstract : Wuliyasitai Sag in Erlian Basin is the Cretaceous fault2through sag and has the single2fault overlap structure. The particular geologic features and reservoir2forming characteristics of Wuliyasitai Sag show that the slope break zone in this sag is the main oil ac2 cumulation unit. The litho2stratigraphic reservoir is the main reservoir pattern of the sag. The hydrocarbon distribution accumula2 tion and enrichment laws indicate that oil and gas mainly exist between two lacustrine flood surfaces and mainly distributed along un2 conformity surface lacustrine flood surface and fault surface. The rapidly subsided unconformity surface is favorable to form the stratigraphic reservoir. The slope break zone controlling the strata and facies of this sag plays obvious role in the distribution of oil and gas which is strictly controlled by sedimentary system. The hydrocarbon accumulation has selectivity on genetic type of sand body while oil and gas enrichment is controlled by favorable sedimentary facies belt and reservoir facies belt. Key words : Erlian Basin ; Wuliyasitai Sag ; sequence stratigraphy ; reservoir2forming pattern ; slope break zone ; hydrocarbon distribu2 tion feature 1988 1 12 2001 ( k1 ba) ( k1 bt 1 ) (k1 bt 2 ) ( k1 bs) 3 1 [ 1 ] [ 2 ] 3 : (040112Ο1) : 1964 1 1989 E2mail :yjy_ysw @petrochina. com. cn

28 2006 27 2 211 ( 1) ; 6 5 [ 3 ] S1 S2 1 Fig. 1 Seismic sequence prof ile framework of Wuliyasitai Sag S1 () ( 2) S2 ( ) Ο 2 S1 Fig. 2 Sedimentary facies of sequence S1 highstand S1 system tract in Wuliyasitai Sag ( 3)

3 : 29 3 S2 Fig. 3 Sedimentary facies of sequence S2 highstand system tract in Wuliyasitai Sag 212 ( 4) ( 3) Ο 4 Fig. 4 Forming pattern of hydrocarbon reservoir in sequence framework of Wuliyasitai Sag 3 S2 ; 311 Ο ( 4) ( 4) ( )

30 2006 27 [ 4 ] ( 4) 3 314 3 : [ 5 ] ; ; ( 1) [ 6Ο9 ] : ; ; : ( 3) ; [ 5 ] Ο ; ( 4) 312 4 [ 7 ] 3 3 ( 5) 3 ( 4) 313 5 Fig. 5 Classif ication of slope break zone

3 : 31 ( 6) 6 Fig. 6 Longitudinal transformation and reservoir2controlling pattern of slope break zone in Wuliyasitai Sag 315 [ 10 ] [3 ]. ( 3) ; [9 ] ( 4 ( 2) 4 [1 ]. [J ]. 1998 25 (2) :8Ο12. [2 ]. [ M ]. : 2001 :1Ο24. [J ]. 2004 9 (3) :40Ο45. [4 ]. [J ]. 2005 26 (1) :38Ο41. [5 ]. [J ]. 2002 23 (2) :115Ο120. [6 ]. [J ]. 2000 25 (5) :260Ο267. [7 ]. [J ]. 2003 24 (3) : 199Ο 203. [8 ]. [J ]. 2003 30 (3) :5Ο7.. [J ]. 2005 26 (2) :26Ο29. [ 10 ]. [ M ]. : 2000 :200Ο215. 2005Ο05Ο24 2005Ο10Ο25 )