Burial History and Petroleum Entrapment in the Yaoyingtai Region of the Changling Fault Depression, China

This work aims to reconstruct the burial history of various kinds of sandstones penetrated by the well YS201 in the Yaoyingtai region of the Changling Fault Depression, southern Songliao Basin, China. Analyses of fluid inclusions in the reservoir rocks, combined with a review of the regional tectonic evolution, revealed the hydrocarbon accumulation stage and accumulation age of the Early Cretaceous Denglouku group and the first member of the Quantou group reservoir, which are the future exploration focus for deep gas reservoirs in this region. Acoustic time data and sedimentary rates calculated for sediments in the YS201 well yielded thicknesses for the Yingcheng, Nenjiang, and Mingshui groups of 506, 539.18, and 144.85 m, respectively, thereby revealing the burial history of the sediments in the well. Fluid inclusions of the Denglouku group reservoir and the first member of the Quantou group reservoir contain oil inclusions and hydro-carbonaceous salt water inclusions. The main peaks of the homogenization temperature and salinity of these saltwater inclusions in the first member of the Quantou group reservoir are generally 110-120℃ and 6wt%-8wt%, respectively, and for the Denglouku group are 130-140oc and 4wt%-6wt%. The data for both reservoirs show only one main peak, indicating that they both have experienced single-stage accumulation. Combining the homogenization temperature of the reservoir fluid inclusions with the burial and thermal history of the sediments in the YS201 well, we infer that the hydrocarbon gas in these two intervals accumulated at 79 Ma （middle Late Cretaceous）.

长岭凹陷沉积微相对岩性油气藏的控制作用——以腰英台地区青山口组为例

岩心、录井和测井资料分析表明:松辽盆地南部长岭凹陷腰英台地区青山口组发育湖泊相和三角洲相沉积,湖泊相由滨浅湖亚相组成,可识别出泥滩、混合滩、砂质滩坝微相;三角洲相由三角洲平原亚相和三角洲前缘亚相组成,三角洲平原亚相可识别出分流河道、分流间湾微相;三角洲前缘亚相可识别出水下分流河道,水下分流间湾,河口坝,席状砂,远沙坝微相。不同类型微相不仅控制了本区岩相变化特征、砂体展布特征和砂体的储集性能,而且对砂体的含油气性也有明显的控制作用。河口坝,水下分流河道和滩坝砂体在储集性能和含油气性方面更具优越性,从而成为勘探开发的重点。沉积微相的展布对本区岩性油气藏分布具有明显的控制作用,湖岸线的活动带为岩性油气藏的富集带。

腰英台地区井壁稳定技术研究与应用

为了有效解决腰英台、乾安、长岭地区嫩江组、姚家组、青山口组等地层的井壁稳定问题,通过分析3个地区地层特点、施工情况,优选了有机硅腐钾聚合物防塌钻井液体系、优选钻具组合和钻井液流变参数,利用有机硅腐钾聚合物钻井液体系较强的封堵能力和抑制性能有效解决了腰英台、乾安、长岭地区井壁易失稳的问题,并达到了提高钻速,缩短钻井周期,降低钻井成本的目的。

长岭断陷东部腰英台地区营城组火山岩储层特征及主控因素分析

利用岩心、薄片、扫描电镜等多种分析手段，从火山岩岩性、岩相特征、储集空间类型等方面研究了腰英台地区火山岩储层特征．分析了火山岩储层物性的影响因素。研究表明：区内火山岩储层主要为流纹岩与凝灰岩，岩相主要为溢流相和爆发相，孔隙类型主要为孔缝组合，储集空间为气孔、溶蚀孔、裂缝等；储层物性影响因素主要有火山岩的岩性、相带、埋深及构造作用。