克拉苏冲断带白垩系储层成岩作用及其对储层质量的影响     

潘荣  朱筱敏  刘芬  李勇  张剑锋 《沉积学报》2014,32(5):973-980

利用大量岩石薄片、铸体薄片、测录井资料及岩芯观察等资料,对库车坳陷克拉苏冲断带白垩系巴什基奇克组储集层的岩石组分、成岩作用及孔隙类型特征等进行了系统研究。其岩石学特征为:成分成熟度低,分选中-好,磨圆次棱角状-次圆状,结构成熟度中等-偏低。储集空间为次生孔隙及原生孔隙。储层经历了压实、胶结、溶解、破裂等成岩作用,主要处于中成岩A2-B期。压实作用以机械压实为主,胶结作用主要为碳酸盐胶结;溶蚀作用导致碳酸盐胶结物、长石颗粒和少量岩屑溶解、破裂作用产生裂缝。在克拉苏断裂的上、下盘地层中,压实作用及胶结作用是孔隙减少的主要原因。断裂带上盘埋深较浅,抬升遭受表生溶蚀作用使得溶蚀孔隙非常发育;断裂带下盘埋深较深,压实和胶结作用使得储层致密化,后期构造挤压破裂作用形成的裂缝及溶蚀扩大缝有效地改善了深部储层物性。  相似文献   

南黄海盆地南部坳陷晚白垩世-第四纪构造演化对油气的控制     

王振鸿  胡明毅  汤济广  薛丹  孙春燕 《化工矿产地质》2014,36(3):129-138

受盆地差异成因机制的影响,南黄海盆地南部坳陷类型及构造演化有多种认识,并存在很大争议。通过重新划分构造单元和构造层,深入研究构造特征;将建湖隆起延伸入海,首次提出将南二凹陷划分为南二凹陷北和南二凹陷南两个凹陷;建立盆地构造格架,明确中新生代构造演化阶段及性质,以张引作用为主与挤压隆升相间,构成多期构造旋回;揭示构造对油气的控制作用,确定阜宁组为烃源岩发育有利层位,南五凹陷为烃源岩分布最优区域,并认为南五凹陷可以存在二次生烃;进行油气成藏模式对比,从而优选南五凹陷为最优区块。  相似文献   

济阳坳陷馆陶组层序地层研究     

杨其栋  魏欣伟  王峰  申欢 《山东地质》2014,(1):8-12

利用钻井、测井、露头和地震等资料采用沉积学、层序地层学、地震地质学等方法,研究济阳坳陷馆陶组沉积特征,并进行了层序地层划分,结果发现：济阳坳陷馆陶组地层主要发育河流相沉积,馆陶组下段存在以浅水湖泊为背景的辫状河三角洲沉积,馆陶组上段发育湖泊三角洲沉积以及曲流河浅水三角洲沉积,在此基础上,进行了层序界面识别与层序划分,可将馆陶组地层可划分出一个构造层序,2个三级层序,层序底界面都为I型层序界面,每个层序内又可划分出3个体系域,即低水位体系域、扩张体系域和高水位体系域。  相似文献   

川西坳陷XC构造带雷口坡组顶部风化壳储层预测   总被引：4，自引：2，他引：2  

蔡左花  冯霞  刘诗荣  宋晓波  王琼仙  隆轲  庞河清 《海相油气地质》2014,(4):50-56

四川盆地川西坳陷XC构造带的中三叠统雷口坡组地层埋深大,地质条件复杂,采用任何单一的技术方法皆难于准确预测雷口坡组顶部风化壳洞缝型储层的分布。在明确沉积储层特征的基础上,依据储层地震响应特征,采用波形分类、地震属性、相干体分析、波阻抗反演等多种技术方法进行储层有利相带预测,建立了一套适合雷口坡组顶部风化壳洞缝型储层的预测技术方法序列。预测结果表明,雷口坡组顶部风化壳洞缝型储层主要分布于XQ构造—XC构造—WX构造一带,综合评价为储层发育有利区;其次分布在HXC构造—FG构造一带,综合评价为储层发育较有利区,其余地区储层相对较差。  相似文献   

桂中坳陷天然气组分特征及其非烃组分成因     

董庸  黄羚  王鹏万  罗宪婴  李丽 《海相油气地质》2014,(1):69-73

桂中坳陷浅层泥盆系—石炭系、二叠系—三叠系天然气显示丰富,其组分主要包括CH4、CO2和N2三种。自北向南,天然气的组分呈现明显分异,石炭系广泛出露区多见富N2气聚集,体积分数达80%~90%,忻城—合山一带二叠系—三叠系残存区,烃类相对富集;中部桂中1井CH4与CO2共存,体积分数相当;向南至D907井见到CH4体积分数达80%。区内CO2为深部热作用下碳酸盐岩分解成因;N2来源于大气,与地面淡水下渗、岩溶作用发育有关。认为坳陷内天然气的较好显示及其组分在空间分布上的差异系由该区保存条件存在差异性所致。  相似文献   

Characteristics and significance of natural gas hydrate reservoir of Triassic in well QH-2 in Harlahu Depression of Southern Qilian Basin     

XIAO Rui  ZHU youhai  LU Zhenquan  LIU Hui  PANG Shouji  ZHANG Shuai  FAN Dongwen  WANG Weichao 《中国地质调查》2014,7(4):20-27

Harlahu Depression is basically a geological blank area now. Few studies on the formation and distribution of natural gas hydrate have been published, especially the research and understanding of natural gas hydrate reservoir in this area. The borehole QH-2 is located in the western part of Harlahu Depression of South Qilian Basin, and it was the first deep drilling hole for natural gas hydrate investigation in this area, in which Quaternary,Neogene—Paleogene and Triassic strata were drilled. The authors took the core of Triassic reservoir in well QH-2 as the research object to study the reservoir characteristics of Harlahu Depression, through the thin section observation of rock, porosity, permeability, rock density, casting thin section and other physical property tests, as well as the logging data. The research shows that Triassic reservoir of well QH-2 is widely distributed with great thickness. However, the physical property of the reservoir is poor, and most parts of the reservoir were unconventional reservoirs. The fractures are not developed, so it is difficult to form fracture type hydrate and pore type hydrate in the consolidated rock stratum similar to Muli area. While, the thick Quaternary loose sediments and Tertiary strata with relatively developed fissures were developed under the permafrost regions in this area, which may provide a better reservoir space for the formation of natural gas hydrate.  相似文献   

周口坳陷叶鲁断裂带构造特征及其演化   总被引：1，自引：0，他引：1  

白桦  杨明慧  曾鹏  王金秀  黄万国 《现代地质》2010,24(6)

叶鲁断裂带位于华北克拉通南部,是鲁山-舞阳-阜阳-淮南断裂带的重要组成部分,控制着周口坳陷谭庄、舞阳等凹陷的形成与演化。据钻井、地震剖面解释和平衡剖面分析,在秦岭-大别造山带挤压活动的影响下,叶鲁断裂带在晚侏罗世—早白垩世向NNE方向强烈逆冲,主断层面倾角约37°,伸展率可达-22 m/Ma;晚白垩世—古近纪,周口坳陷处于伸展构造环境,该断裂带发生负反转构造作用。通过三角剪切软件模拟了叶鲁断裂带主断层在周参12井区的构造演化过程。模拟显示主断层形成时的总滑动量约为6 100 m,断层传播量为9 150 m,三角剪切角为150°,p/s值为1.5。  相似文献   

The origin and distribution of natural gas in the frontal uplift area of the Kuqa depression,Tarim Basin   总被引：1，自引：0，他引：1  

Jie Cui  Guangyou Zhu  Bin Zhang  Jin Su  Yuhong Lu  Chenglong Ma 《中国地球化学学报》2010,29(3):313-318

The frontal uplift of the Kuqa depression is an important oil and gas producing area. In this study, the distribution and origin of natural gas were discussed based on natural gas components and isotope data. The main components of natural gas were hydrocarbons with relatively high contents of C2+ component. Most gases were de-rived from terrestrial source rocks, and some came from marine rocks. The contents of non-hydrocarbon gases were high in the central part of the frontal uplift area and low in the two terminals. The distribution of oil composition was similar to that of natural gas, which was mainly controlled by the types of source rocks. Dry coefficient and maturity of natural gas in the frontal uplift were lower than those of gas in the Kelasu tectonic belt of the Kuqa depression, which was mainly affected by the difference of tectonic movements in both areas. In the frontal uplift, the traps were formed in the early stage and could capture the early formed oil and gas, and structural adjustment was slight in later stages, so the oil and gas could be effectively preserved. Multiperiodic oil and gas filling led to the complex distribu-tion of natural gas.  相似文献   

列车动荷载下的黄土振陷研究     

丁勇  王家鼎  何小亮 《地下水》2010,32(5):85-86,119

以拟建大（同）～西（安）客运专线为例,选取典型黄土地段,采集原状马兰黄土和离石黄土进行室内常规试验和动三轴试验,研究了长持时、小振幅作用下黄土振陷特性,通过三组比较试验,得出了黄土振陷与动荷载、埋深、振次、振动频率的定性关系,并对振陷机理做了探讨。  相似文献   

安徽宁国胡乐奥陶系再研究     

宫维莉  齐敦伦  毕治国  姜立富 《安徽地质》2010,20(2):85-89

宁国胡乐地层区划属扬子地层区江南地层分区。区内奥陶系分布广,出露全,剖面完整且层序清楚,化石丰富,在国内及大区域内均具典型性和代表性。本区奥陶系自下而上为谭家桥组、宁国组、胡乐组、砚瓦山组、黄泥岗组、新岭组,与下伏晚寒武世至早奥陶世西阳山组、上覆晚奥陶世至早志留世霞乡组及系内各组间均为连续沉积整合接触。在胡乐梅树下发现原砚瓦山组下部地层,在胡乐将军岭首次发现宁国组浊流沉积及其鲍玛序列。  相似文献