Abstract:

Jurassic large oil sands reservior of Houba is located in Jiangyou City of Sichuan Province, and belong to the monoclinic tectonic unit of nappe structural belt in Longmenshan northern section where oil sands of Jurassic Shaximiao Lower Segment outcroppe in surface. There are rich oil sands resources confirmed by drilled wells ,and the average thickness is 34.7 m about oil sands layer, oil rate is 9.46% in average, a preliminary calculation of the oil sands distribution area is 26.79 km² in depth of 0-500 m.By detailed study in target area,the main factors of Houba Jurassic oil sands reservoir are that ①the Cambrian source rocks provide sufficient oil source for the reservoirforming of Houba Jurassic oil sands; ②high oil rate in reservoir sandstone, large thinckness of oilsand,  good reservoir physical property and space; ③ the regional tectonic belt of Longmenshan north section controls the formation and distribution of oil sands,and the good configuration of thrust fault, joint developed belt and medium-coarse sandstone in high porosity is the most favorable formation condition of oil sands,another Himalayan tectonic tilting, fault transporting and piedmont denudation are necessary conditions of formation and preservation about oil sands.

Key words: Sichuan basin, Houba large oil sands reservior, Jurassic, reservoir-forming main factors