共查询到20条相似文献，搜索用时 62 毫秒
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准噶尔盆地车排子地区北部新近系沙湾组砂岩储层中发育碳酸盐胶结物,该胶结物含量直接影响储层的含油性。为了定量识别碳酸盐胶结物,本文以岩芯常规分析数据为基础,利用图像分析软件进行微观薄片定量测量,弥补了岩芯常规分析数据的不足,发现车排子地区北部沙湾组砂岩中碳酸盐胶结物的含量(Y)与地层水中Ca~(2+)浓度(X)呈很好的正相关性(Y=0.0512·X~(0.7155)),相关系数达到0.93。利用地层水Ca~(2+)的浓度定量计算碳酸盐胶结物获得比较好的结果,解决了无实验分析井的碳酸盐胶结物含量求取的难题。对比分析碳酸盐胶结物数据和试油试采数据,发现碳酸盐胶结物含量≥20%的井基本不产油,碳酸盐胶结物含量20%的井产油性较好,表明碳酸盐胶结物控制车排子地区北部新近系沙湾组砂岩储层的含油性。 相似文献
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长南工区属于鄂尔多斯盆地中部、南部,主要分布在安塞、延安、志丹、高家沟等地区,地质构造属于鄂尔多斯盆地伊陕斜坡构造。该区地表开始为新生界第四系黄土层,黄土高原丘陵沟壑区,表层具有节理发育、结构松散、渗透性强等特点,有垂直方向的空洞,漏失不易控制且破坏地层的胶结强度,促进漏失加剧。以下地层从中生界到古生界,地层古老,富含砂砾岩和石英砂岩,研磨性强,可钻性差,区域差异较大。针对该工区钻井技术难点,制定了详细对策,表层抑制井漏和堵漏、优选钻井液体系提高机械钻速,优选钻头系列,预防减少钻具失效等。通过应用实施,取得了明显效果,区块钻井速度大幅提高,初步形成了一套适合该区的钻井综合提速技术。 相似文献
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中国页岩气资源开发潜力巨大,近年来页岩气勘探开发力度不断加大,对钻探工艺和技术的要求不断提高。页岩气地层岩性主要为泥岩、砂岩、页岩、碳质板岩、灰岩,该类地层胶结性差、破碎、井壁强度低,钻进中易出现孔壁失稳,发生坍塌、卡钻、埋钻等孔内事故,需要研制具有强抑制性、低成本、绿色环保的冲洗液体系来保证施工安全。本文通过对页岩气井壁稳定机理的探究,优选出一种适用于页岩地层双聚防塌和成膜防塌低固相冲洗液体系,该体系由抑制剂、防塌剂、降失水剂、润滑剂、封堵剂、流型调节剂等处理剂组成,具有良好的抑制性和胶结性。现场应用取得了良好的效果,保证了项目的顺利施工。 相似文献
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从地质因素和绳索取心钻进工艺因素两方面分析了大河煤田施工中存在的钻孔漏失、坍塌、缩径、超径等复杂情况,并根据不同地质条件提出了不同的技术措施：对上部胶结性差的松散地层、石灰岩溶涧发育地层、构造破碎地层可采用技术套管护壁隔离;对钻孔不返水等中等漏失地层,可采用锯末加堵漏剂或聚丙烯酰胺等堵漏材料进行堵漏;对钻进关岭组、飞仙关组的泥岩等水敏性地层、构造破碎地层、厚粉煤层等易发生缩径、掉块、坍塌等复杂地层,可采用不同性能及类型的DLSAS泥浆、KHm类和聚丙烯酸盐类（CPAN、PAC141等）聚合物钻井液体系的优质泥浆进行护壁防塌钻进。上述措施的实施,保障了复杂地层的钻进工作,成孔均达到了设计要求。 相似文献
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云南江城钾盐基准井位于思茅凹陷东区南部向斜翼部两条断层交汇处,构造相对发育,岩石破碎。其施工目的主要目的是通过取心钻进获取＂中、新生代＂含盐建造完整的地层序列,建立一个可供找钾参照的＂标杆地层柱＂。其施工的难点是上部地层以石英砂岩为主,与泥岩互层,泥岩较软、易水化、难取心;砂岩坚硬、研磨性强;下部地层主要以泥岩为主夹薄层砂岩,泥岩致密硬脆,在孔底呈弹塑性,可钻性极差。通过选择合理的钻井设备,优化钻具组合,制订切合实际的钻进参数,采用镁基盐水钻井液,进行川-74取心筒传统取心和绳索取心钻进,获得了盐矿心无溶蚀现象,井眼轨迹和岩心采取率均达到设计要求的较好效果。 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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正1 Introduction Geological studies established on several sections in Lanping-Simao basin have shown that the salt-bearing strata of Mengyejing formation(Yunlong Fm.in Lanping basin)are constituted by an alternation of salt layers and interbedded facies.The latter consists mainly of mudstones,and mudstone-rich conglomerate.The mineralogy and geochemistry of salt-bearing beds and 相似文献
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正On 22nd April 2014,with the approach of the 45th World Earth Day,China’s Ministry of Land and resources issued the status of China’s mineral resources in 2013.The first task of the prospecting breakthrough strategy action implemented in the last five years has been completed,and China’s security capacity for mineral resources has been significantly improved.In the 相似文献
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正There are more than 700 salt lakes with area of more than 1km2 on the Qinghai-Tibet Plateau of China.In recent years,an oilfield brine was also found in the Nanyishan Section of Qaidam Basin in the Qinghai-Tibet 相似文献
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正1 Introduction Physical and numerical models are constructed to investigate the evolution and mechanism of salt migration driven by tectonic processes.In recent years,we have designed and ran series of models to simulate salt 相似文献
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YUAN Qin LI Jianguo QIN Zhanjie WEI Haicheng SHENG Shurong SHAN Fashou 《《地质学报》英文版》2014,88(Z1):276-276
正The study of Cretaceous-Palaeogene salt-bearing strata of the Khorat Basin Laos and the Lanping-Simao Basin in Yunnan,China has an great significance not only in explaining the basin evolution and the genesis of potash 相似文献
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正Potash is one of the long-term scare deposits in China,and potash prospecting has long been listed as a key brainstorm project for our nation and geological prospecting units.There have been considerable studies in search for potash deposits in the Kuqa depression of the Tarim basin(Jackson et al.,1991;Gemmer et al.,2004;Vendeville,2005;Vendeville and Jackson,1992a,1992b), 相似文献
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正1 Introduction Qaidam Basin in Qinghai,including 43 salt lakes with multiple dominant mineral such as potassium,magnesium,lithium etc.,is the most intensive distribution of Saline 相似文献