塔北地区辫状三角洲沉积特征及油气勘探意义

塔北地区的三叠系、白垩系卡普沙良群发育较为典型的辩状三角洲沉积。依其沉积特征可划分为：平原亚相、前缘亚相、边缘席状砂亚相。该类砂体与扇三角洲及其它类型的三角洲砂体相比，具有分布稳定（可达千余平方千米）、展布广、储层物性好的特点，是本区潜在大油气田的良好储层。正确地区分和识别该类沉积，不仅具有重要的理论意义，更具实际意义。

BRAIDED DELTA SEDIMENTATION AND OIL-GAS EXPLORATION IN THE NORTHERN TARIM AREA

The Triassic and Cretaceous Kapushaliang group in the Northern Tarim area are typical braided delta sediments of plain sub-phase,frontal margin sub-phase and margillal sheeted sand sub-phase according to their sedimentary characteristics. Comparing with sands of fan delta and other types of delta those of the braided delta have more stable distribution (up to thousand square kilometers), wider extension and better reservior property, and so form a better reservior for a bigger potential oil-gas field. Proper differentiation and discrimination of these sediments have both important theoretical and practical significance.