[1]伍劲,高先志,周伟,等.柴达木盆地东坪地区基岩风化壳与油气成藏[J].新疆石油地质,2018,(06):666.[doi:10.7657/XJPG20180606]
 WU Jin,GAO Xianzhi,ZHOU Wei,et al.Base Rock Weathering Crusts and Petroleum Accumulation in Dongping AreaQaidam Basin[J].Xinjiang Petroleum Geology,2018,(06):666.[doi:10.7657/XJPG20180606]
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柴达木盆地东坪地区基岩风化壳与油气成藏()
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《新疆石油地质》[ISSN:1001-3873/CN:65-1107/TE]

卷:
期数:
2018年06期
页码:
666
栏目:
出版日期:
2018-12-01

文章信息/Info

Title:
Base Rock Weathering Crusts and Petroleum Accumulation in Dongping AreaQaidam Basin
文章编号:
1001-3873(2018)06-0666-07
作者:
伍劲1高先志2周伟3张永庶4杨云4由超4
(1. 中国石油 杭州地质研究院,杭州 310023;2. 中国石油大学 地球科学学院,北京 100249;3. 成都理工大学 能源学院,成都 610059;4. 中国石油 青海油田分公司 勘探开发研究院,甘肃 敦煌 736202)
Author(s):
WU Jin1 GAO Xianzhi2 ZHOU Wei3 ZHANG Yongshu4 YANG Yun4 YOU Chao4
(1.Hangzhou Research Institute of Geology, PetroChina, Hangzhou, Zhejiang 310023, China; 2.School of Geosciences, China University of Petroleum, Beijing 102249, China; 3.School of Energy Resources, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 4.Research Institute of Exploration and Development, Qinghai Oilfield Company, PetroChina, Dunhuang, Gansu 736202, China)
关键词:
柴达木盆地东坪地区基岩风化壳溶蚀作用花岗片麻岩花岗岩油气藏形成
Keywords:
Qaidam basin Dongping area base rock weathering crust dissolution granitic gneiss granite hydrocarbon accumulation
分类号:
TE112.5
DOI:
10.7657/XJPG20180606
文献标志码:
A
摘要:
东坪地区是柴达木盆地阿尔金山山前的一个斜坡区,远离生烃中心,但在其基岩中发现了东坪1井区和东坪3井区2个气藏,东坪地区基岩气藏的形成与基岩风化壳有密切关系。基于矿物蚀变特征、风化产物特征和溶蚀孔缝发育特征研究,把东坪地区基岩风化壳结构划分为完全风化层、半风化层和未风化层,半风化层进一步分为风化溶蚀带和风化崩解带,两者的溶蚀作用和矿物蚀变程度不同,风化溶蚀带发育溶蚀孔洞和强溶蚀加宽网状裂缝,而风化崩解带发育弱溶蚀的低角度风化节理缝和高角度构造缝。统计东坪地区平均单井基岩风化壳厚度超过200 m,远大于昆北地区的基岩风化壳厚度,这与古近系沉积前东坪地区古地势较低有关。因花岗片麻岩比花岗岩更易风化,东坪1井区(花岗片麻岩分布区)风化壳厚度大于东坪3井区(花岗岩分布区)。另外,先存断裂和裂缝发育区风化壳厚度大。风化壳半风化层对油气从生烃凹陷长距离运移到研究区起到了重要的输导作用,同时也是基岩油气藏的重要储集层;研究区完全风化层因厚度较薄,不足以单独构成良好盖层,仅对油气的分布起到隔夹层作用。
Abstract:
The Dongping area is located in the piedmont slope of the Altun Mountains in Qaidam basin and far from the hydrocarbon center. Two gas reservoirs have been discovered in the base rocks of Dongping-1 block and Dongping-3 block, respectively. The forming of the gas reservoirs in the base rocks of the Dongping area are closely related to the base rock weathering crust. On the basis of the study on the features of mineral alteration, weathering products and dissolved pore development, the structure of the base rock weathering crust in the area is classified into completely weathered layer, semi-weathered layer and unweathered layer, the semi-weathered layer is further divided into weathering dissolved belt and weathering disintegration belt and the two belts have different dissolution and mineral alteration degree. Dissolved pores and strong-dissolved widened map crackings are developed in the weathering dissolved belt, and weak-dissolved low-angle weathering joint fissures and high-angle structural fractures are found in the weathering disintegration belt. The average thickness of the base rock weathering crust in individual wells is more than 200 m in the Dongping area, much larger than that in Kunbei area, which is related to the paleo-terrain of the area before the deposition of the Paleogene. Because granitic gneiss is easier to be weathered than granite, the weathering crust in Dongping-1 block(where granitic gneiss is mainly distributed) is thicker than that in Dongping-3 block (where granite is mainly distributed). Additionally, the weathering crust is thick in the area where fault and fracture are developed. The semi-weathered layer plays an important role in oil and gas migration from hydrocarbon generation sag to the study area, meanwhile, it is the key reservoir for hydrocarbon accumulation in base rocks. The completely weathered layer is relatively thin and can’t be a good cap rock, so it only can act as a barrier or an interlayer

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更新日期/Last Update: 2018-12-05