1. School of Earth Science and Engineering Hebei University of Engineering Handan Hebei 056038 China
2. College of Geoscience and Surveying Engineering China University of Mining and Technology (Beijing) Beijing 100083 China
3. Shanghai Branch, China National Offshore Oil Co., Ltd. Shanghai 200030 China
4. Department of Geosciences Virginia Polytechnic Institute and State University Blacksburg VA 24061 USA
5. Department of Geological Sciences, Jackson School of Geosciences University of Texas Austin TX 78712 USA