| 塔里木盆地西南部昆仑山前下白垩统沉积相特征及石油地质意义 |
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| 引用本文： | 张惠良,沈扬,张荣虎,李玉文,杨晓宁,刘胜,邱斌,杨芝林.塔里木盆地西南部昆仑山前下白垩统沉积相特征及石油地质意义[J].古地理学报,2005,7(2):157-168. |
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| 作者姓名： | 张惠良 沈扬 张荣虎 李玉文 杨晓宁 刘胜 邱斌 杨芝林 |
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| 作者单位： | 中国石油勘探开发研究院杭州地质研究所,浙江杭州,310023;中国石油塔里木油田分公司,新疆库尔勒,841000 |
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| 摘 要： | 塔里木盆地西南部沿昆仑山前分布一套逾千米厚的下白垩统碎屑岩，岩相以浅红色中、细砂岩，褐红色砂砾岩、砾岩为主，夹浅红色泥岩和薄层浅灰色细砂岩。按生物组合及岩性特征，自下而上可划分5个岩性段。第1段为灰绿色泥岩段，沉积环境以湖相和前扇三角洲沉积为主；第2段为砂砾岩段，沉积环境以扇三角洲前缘和平原沉积为主；第3段为含砾粗砂岩段，沉积环境以辫状河－辫状河三角洲平原沉积为主；第4段为细砂岩夹泥岩段，沉积环境以辫状河三角洲前缘水下分流河道沉积为主；第5段为泥岩夹砂岩段，沉积环境为辫状河三角洲前缘、前辫状河三角洲和滨浅湖相沉积。沉积环境由快速堆积的扇三角洲-冲积扇向辫状河-辫状河三角洲演化，沉积厚度达1000余米。构造背景为强烈拉张的构造环境，是断陷盆地发育的重要时期。中细砂岩达70％以上，砂岩孔隙类型为原生粒间孔，孔隙度10％~20％，渗透率1~1000×10－3μm2，是塔里木盆地中生代油气勘探的重要目的层系。
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| 关 键 词： | 塔里木盆地 昆仑山 下白垩统 沉积相 石油地质意义 |
| 文章编号： | 1671-1505(2005)02-0157-12 |
| 修稿时间： | 2004年6月15日 |
Characteristics of sedimentary facies and petroleum geological significance of the Lower Cretaceous in front of Kunlun Mountains in southwestern Tarim Basin |
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| Zhang Huiliang,Shen Yang,Zhang Ronghu,Li Yuwen,Yang Xiaoning,Liu Sheng,QIU Bin,YANG Zhilin.Characteristics of sedimentary facies and petroleum geological significance of the Lower Cretaceous in front of Kunlun Mountains in southwestern Tarim Basin[J].Journal of Palaeogeography,2005,7(2):157-168. |
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| Authors: | Zhang Huiliang Shen Yang Zhang Ronghu Li Yuwen Yang Xiaoning Liu Sheng QIU Bin YANG Zhilin |
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| Institution: | 1.Hangzhou Institute of Geolog , PetroChina Exploration and Development Research Institute, Hangzhou 310023, Zhejiang;2.PetroChina Tarim OilField Company, Kurla 841000，Xinjiang |
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| Abstract: | A set of clastic rocks with thickness of more than one thousand meter was deposited in the Lower Cretaceous in front of the Kunlun Mountain in southwestern Tarim Basin. They are mainly red fine-middle grained sandstone, maroon sandy conglomerate, conglomerate, with mudstone and thin interbeded grey fine sandstone. Based on the group of fossils and lithologic characteristics, the Kezilesu Group are divided into 5 lithologic members: the first one is the sage green mudstone Member of which the sedimentary environment was mostly lake and fan delta. The second one is sandy conglomerate of which the sedimentary environment was mainly the front and plain of fan-delta. The third one is thick gravel-sandstone of which the sedimentary environment was mainly braided river and braided river delta plain. The fourth is mostly fine-grained sandstone interbedded with mudstone, of which the sedimentary environment is underwater distributary channel on braided river delta front. The last one is mudstone interbedded with sandstone of which the sedimentary environment is braided river delta front, probraided river delta and shore-shallow lake. The evolution of sedimentary environments changing from quickly deposited fan-delta to alluvial fan-braided river to braided river delta shows the significant development period of the fault basin. Over 70 percent of the clastic rocks is medium-fine-grained sandstone, whose pore types are original intergranular pores with porosity of 10%~20% and permeability of 1~1000×10－3μm2. The Kezilesu Group is the important strata for oil and gas exploration in the Mesozoic in Tarim basin. |
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| Keywords: | Tarim Basin Kunlun Mountains Lower Cretaceous sedimentary facies petr-oleum geological significance |
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