Lower Carboniferous sediment sequence and sandbody forecasting in Hade area, Tarim Basin

Rich information from cores and well logs, principles and tools of sedimentology and high-resolution sequence stratigraphy, were used for a delicate sequence analysis of the thin marine reservoirs in lower-mudstone section, Lower Carboniferous in Hade area, Tarim Basin, which are low energy sandy coastal sediments of highstand system tract of sequenceⅠ, consisting of many shallow-up coarse para-sequences which builds an aggression parasequence set. With the slow fall of sea level, the environment of HST was gradually changed to the alternative environments of offshore and shoreface-foreshore, and finally changed to coastal plain. Five thin-sand-beds are separated by marine mudstone into isolated sheet lenticles, and changed to mudstone laterally. The sand direction is nearly NW to SE, distributed along palaeo-shoreline. These beds are obviously controlled by sequence setting, palaeo-geomorphology and sediment supply. Some huge stratigraphic reservoirs mainly controlled by lithology could be the potential petroleum play targets.