Wanchang and Liangjia structural belts are the important hydrocarbon accumulation zones in Chaluhe faulted depression,controlled by different structures in the process of formation and evolution.The Wanchang structural belt is controlled by the basin-controlled fault in southeastern margin,while the Liangjia structural belt is controlled by the No.2 fault,which led to different sand facies.According to drilling core,well-logging and seismic data,the fan delta in Wanchang structural belt and underwater fan deposits in Liangjia structural belt are the domain sandstone sediments in shallow Wanchang Formation.The continuity and physical property of sand bodies in Wanchang Formation are good,especially,the distributary channel and braided channel sand near to provenance have higher porosity and permeability.The source rocks are well developed in Shuangyang-,Sheling-and Yongji formations.Basin-controlled faults and their derivative faults help the hydrocarbon migration and sealing.Therefore,the hydrocarbon accumulation are great in conditions.

Chaluhe fault depression is a graben inland one, where there are 6 third class sequence strati-graphic units. By analyzing the depositional features of the different system tract of every sequence, the authors consider that the dark mudstone of transgressive system tract and highstand system tract is characterized by phase presenting transition laterally and alternation vertically, by comparison with the lowstand system wedge, fan of the lowstand system tract, and the large-scale delta - limnetic facies ore mass of highstand system tract. The mudstone formed a favorable source-reservoir-caprock associateion, lensing lithologic traps in the lowstand system tract in Xin' anbao sag, and lithologic or complex lithologic traps in the lowstand system tract around the Xin'anbao sag and Wanchang tectogene. It created favorable condition for forming the lithologic oil reservoir in the region.

伊通盆地可以划分出莫里青一鹿乡断陷E2s、E2sh含油气系统和岔路河断陷E2s、E2sh含油气系统2个含油气系统及岔路河断陷E2s、E2sh、E2y-E3w复合含油气系统;在分析含油气系统形成的条件及含油气系统内油气富集带、油气藏的分布特征基础上,结合前人的研究成果,提出下步勘探方向.