准噶尔盆地南缘齐古─小渠子地区构造特征及油气勘探前景

本文在研究准噶尔盆地南缘齐古─小渠子地区地面地质及山地地震资料的基础上，确定了齐古构造主要是由燕山期与喜山期构造迭加，受强烈挤压冲断所致，背斜构造基本对称，保存较为完整；昌吉背斜、喀拉扎背斜与之具有一致性。油气主要来自其北部的昌吉凹陷二叠系芦草沟组；成藏期为燕山期，在喜山期油气藏遭受破坏，油气重新分配，并与进入生油门限的侏罗系煤系低成熟油气相混。齐古一小渠子地区侏罗系、三叠系是目前盆地南缘最现实的找油领域。

THE STRACTURE CHARACTERISTICS AND PROSPECTS FOR HYDROCARBON EXPLORATION IN QIGU-XIAOQUZI AREA IN SOUTHERN MARGIN OF JUNGGAR BASIN

Based on a study of the surface geologic and mountainous seismic data obtained in QiguXiaoquzi area in southern margin of Junggar basin. An interpretation model for Qigu structure isdetermined, which was formed by structural superposition in period of Yanshan-Himalayanorogeny and subjecting to an intense compaction and thrusting in this paper. It is demonstrated to be a generally symmetrical anticline, being relatively well preserved and is consistentwith Chang n and Kalaza anticlines in nature. The hydrocarbon source appears to be Lucaogouformation (permian ) in north part of Chang n depression, and a reservoir formation period wasoccurred in Yanshan orogeny. The reservoir was, however, subjected to damage during Himalayan movement, resulting in a redistribution of hydrocarbon, and a mixing of the coaliferous matured crude oil (Jurassic). It is concluded that the Jurassic and Triassic formations inQigu-Xiaoquzi area is the most actural oil-prospecting domains in southern margin of Junggarbasin. The breakthrough occurred in well Qi-8 drilled into Badaowan formation (Jurassic)andXiaoquangou formation (Triassic) promises a high prospects in the oil exploration in thisarea.