天山南北前陆盆地侏罗系-白垩系沉积及储集层特征对比  

Comparative Analysis on Sedimentary and Reservoir Characteristics of Jurassic to Cretaceous Between Foreland Basins in Southern and Northern Tianshan Mountains

作　　者：高志勇[1,2] 冯佳睿[1,2] 崔京钢[1,2] 周川闽[1,2] 石雨昕 GAO Zhiyong;FENG Jiarui;CUI Jinggang;ZHOU Chuanmin;SHI Yuxin(PetroChina Research Institute of Petroleum Exploration and Development,Central Laboratory of Geological Sciences,Beijing 100083,China;PetroChina Research Institute of Petroleum Exploration and Development,State Key Laboratory of Enhanced Oil Recovery,Beijing 100083,China)

机构地区：[1]中国石油勘探开发研究院实验研究中心,北京100083 [2]中国石油勘探开发研究院实验研究中心提高石油采收率国家重点实验室,北京100083

出　　处：《新疆石油地质》2020年第1期80-92,共13页Xinjiang Petroleum Geology

基　　金：国家科技重大专项(2016ZX05003-001);中国石油天然气股份有限公司课题(2019B-0505)。

摘　　要：通过库车坳陷与准噶尔盆地南缘侏罗系-白垩系厚度、岩性组合和沉积相对比分析,认为由于早白垩世之前天山南部古地势高于北部,使得库车坳陷与准噶尔盆地南缘在以上3方面存在明显差异,进而明确了库车坳陷侏罗系各组厚度均小于准噶尔盆地南缘,以及早侏罗世沉积环境存在显著差异的成因机制。晚侏罗世-早白垩世,天山南北古气候、构造古地理和古地形的差异,以及晚白垩世末期构造隆升与剥蚀作用,造成了库车坳陷与准噶尔盆地南缘白垩系沉积环境和厚度的差异,也造成了两者的储集层碎屑组分、埋藏方式、裂缝发育程度等方面的差异。在进一步厘定准噶尔盆地南缘深层岩相古地理特征和有利砂体展布范围的基础上,梳理天山南北前陆盆地深层储集层特征和控制因素的差异,认为勘探程度较低的准噶尔盆地南缘深层储集层受沉积相、地温梯度、埋藏方式、异常高压、次生溶蚀作用、构造缝等控制,指出了准噶尔盆地南缘深层有利储集层分布区。Based on the comparative analysis of the Jurassic and Cretaceous strata in Kuqa depression and the southern margin of Junggar ba⁃sin,it is considered that the paleotopography in the southern Tianshan was higher than that in the northern Tianshan before the Early Creta⁃ceous,which is the main reason causing the significant differences in the thickness,lithologic association and sedimentary facies in the 2 ar⁃eas.Furthermore,it is identified that each Jurassic formation in Kuqa depression is thinner than that in the southern margin of Junggar basin and the genetic mechanism of different sedimentary environments in the Early Jurassic is determined.From the Late Jurassic to Early Creta⁃ceous,the differences in ancient climate,tectono⁃paleogeography and topography,and the structural uplifting and denudation at the end of Late Cretaceous resulted in the differences in sedimentary environment and thickness,clastic component,burial mode and fracture develop⁃ment degree in the 2 areas.On the basis of further determination of the lithofacies palaeogeography characteristics and favorable sandbody distribution in the deep strata of the southern margin,the paper analyzes the differences in reservoir and its controlling factors between the foreland basins in the southern and northern Tianshan Mountains,concludes that the deep reservoirs in the southern margin with relatively low exploration degree are controlled by sedimentary facies,geothermal gradient,burial mode,abnormal high pressure,secondary dissolution and tectonic fracture,and points out the favorable areas for reservoir distribution in the deep strata of the southern margin of Junggar basin.

关 键 词：天山南北 前陆盆地 库车坳陷 准噶尔盆地 侏罗系 白垩系 沉积相 有利储集层 储集层特征 

分 类 号：TE112.221[石油与天然气工程—油气勘探]