The complex tectonic background of the Bohai Basin during the deposition of the member 4 of the Shahejie Formation(Sha-4 Member)means that this stratigraphic unit is spatially complex and variable.At its type section in the Jiyang Depression,the member 4 can be divided into the upper,middle and lower sub-members.With increasing borehole data and further investigation,our understanding of the member 4 of the Shahejie Formation has been improved.In the past,the member 4 was not subdivided into submembers and it was recognized as two types in the southern and northern Bohai Basin.With new data and complete successions,the member 4 in the Bohai Basin can be divided into,we can now divide this member into the upper and lower sub-members,which were deposited in very different conditions.The lower sub-member is characterized by evaporitic lacustrine deposits,whereas the upper sub-member is characterized by sandy mudstones.Drill holes in the southern Bohai Basin have penetrated the entire Member 4,whereas drill holes in the northern Bohai Basin only penetrated the upper sub-member and the lower sub-member is probably missing.Regardless,the lithostratigraphy of the Member 4 is comparable in the southern and northern Bohai Basin.The lower sub-member 4 in the Bohai Basin can be correlated with the upper and lower sub-members in the Jiyang Depression.The lower sub-member in the Bohai Basin is not an ideal target for petroleum exploration,whereas the upper sub-member has a suite of cource-reservoir-cap rocks and should be a exploration target.

一、国有资本经营模式与市场经济制度 我国社会主义市场经济制度是市场经济与社会主义基本经济制度的结合.市场经济通过市场配置资源,追求的目标是经济效益最大化;计划经济通过政府计划和指令配置资源,追求的目标是社会公正和社会整体价值最大化;市场经济与计划经济就像动物与植物的关系一样,其基因(资源配置方式)的差异必然导致其习性和偏好的不相容.所以,市场经济与社会主义基本经济制度的结合只能是两种不同社会资源配置方式的共存,而不应该是市场经济与计划经济之间的嫁接式融合.