Distribution characteristics and significance of hydrocarbon shows to petroleum geology in Kalpin area, NW Tarim Basin

摘要

Abundant hydrocarbon shows are distributed in five different regions in the Kalpin area, northwestern Tarim Basin: Aksu hydrocarbon shows region, Subashi hydrocarbon shows region, Sanchakou hydrocarbon shows region, Piqiang hydrocarbon shows region, and Sickl hydrocarbon shows region, totaling 27 hydrocarbon show points. From the statistical analysis of all hydrocarbon shows in the study area, the paper summarizes the distribution characteristics. Combined with field investigation, previous documents of Kalpin area and oil-source correlation of hydrocarbon shows, the authors indicate that large tnultilayered oil-bearing paleo-reservoirs existed in the geological process in the Kalpin area, such as Aksu paleo-reservoirs and Piqiang paleo-reservoirs. Despite destruction by several periods of tectonic events after the formation of paleo-reservoirs, many reservoirs may still be left undamaged. Giant gas fields below the Middle Cambrian gypsum-salt bed could be preserved in the Kalpin area. In addition, the Middle-Lower Permian Balikelike formation, with good oil generating condition is an important exploration target in the Kalpin area.