Structural/Sedimentary Environment and Hydrocarbon-Generating Potentials of Carboniferous in Junggar Basin

Carboniferous epoch is the conversion period of tectonic geologic environment in Junggar basin,in which land mass splicing was accompanied with a large number of gulfs;coastal marshes were formed by continental-oceanic transition,being favorable to development of source rocks;coexisting rifted and island-arc types igneous rocks constructed multi-type reservoir bodies.Such a change of geologic environment created conditions for development of multi-set source rocks of Carboniferous in Junggar basin,while the abroad deposition added its petroleum resource potentials and explorative ranges.The study shows that there exist multi-set source rocks in Carboniferous with high organic matter abundance,possessing material bases for forming large reservoirs.It is concluded that Eastern Junggar-Wucaiwan is a realistic area for natural gas exploration;the lower wall of thrust fault belt in northwestern margin of Junggar basin is of large potentials for petroleum exploration;the hinterland and southern part of this basin are of great prospects for it,hopefully discovering large-and medium-sized oil-gas fields;the explorative potential of Wulungu area should not be overlooked.