【作者】 冯亚琴；

【导师】 张云峰；

【作者基本信息】 东北石油大学 ， 矿产普查与勘探， 2011， 硕士

【摘要】 贝尔凹陷是位于海拉尔盆地南部的一个次级负向构造单元。近年来在贝尔凹陷的南屯组一段中发现了较好的油气显示,并且在生产过程中也收到了可观的成果。由于贝尔凹陷的储层特征还不清楚,限制了该区的勘探、开发步伐。本文综合利用地震、测井、录井、岩芯、生产测试等地质信息,对贝尔凹陷南屯组一段储集特征进行研究。贝尔凹陷南屯组一段的储层主要包括火山碎屑岩储层和碎屑岩储层。碎屑岩储层以岩屑砂岩和长石岩屑砂岩为主,成熟度较低。次生孔隙是南屯组一段的主要储集空间,主要类型为粒内溶孔、填隙物溶孔、溶蚀粒间孔、火山碎屑粒内溶孔。南屯组一段的储层微观特征总体均较差。贝尔凹陷南屯组一段储层以低孔低渗和低孔特低渗为特征。纵向上南屯组一段处于异常高孔带上,次生孔隙是存在于该层位的主要储集空间。平面上苏德尔特潜山构造带和贝中次凹的物性特征为最优。贝尔凹陷南屯组一段的储层主要分布于辨状河三角洲平原、辨状河三角洲前缘、扇三角洲平原和扇三角洲前缘沉积亚相上。它的成岩作用类型包括机械压实作用、胶结作用、交代作用、溶蚀作用等,其中前两者使得储层储集空间降低,而交代作用与溶蚀作用则大大改善了储集空间。火山碎屑岩储层的主要岩性为凝灰岩、沉凝灰岩和凝灰质砂砾岩等。贝尔凹陷南屯组一段的储层主要位于中成岩阶段A2期,次为中成岩阶段B期。分布于该层位的主要成岩相有凝灰质溶蚀相、长石溶蚀相、方解石胶结相、泥质胶结相、泥岩压实相、压实胶结相。通过综合分析地震、录井、测井、扫描电镜、铸体薄片、生产测试、地化分析等多种资料得出：“烃灶”的分布、有利的沉积和成岩相带以及古不整合面的存在等是贝尔凹陷南屯组一段优质储层形成的主控因素。在对这四种主控因素进行综合分析的基础上,发现辨状河(扇)三角洲平原和辨状河(扇)三角洲前缘沉积亚相为最有利的沉积相带,凝灰质溶蚀成岩相和长石溶蚀成岩相是改善储集物性的有利成岩相带。在综合考虑‘烃灶’与古不整合面存在的前提下,结合有利的沉积和成岩相带对优质储层的分布进行平面预测。更多还原

【Abstract】 Beier depression is a negative structure unit located in the southern of the central rift zone in Hailer Basin. In recent years, people find better oil and gas show in the first member of Nantun formation reservoir and the considerable results are obtained in the production process. Because of the indistinction of the reservoir characters in Beier depression, the step of exploration and development is limited. This paper applies comprehensively the seismic, logging, core and production testing to study the reservoir characteristics of the first member of Nantun formation in Beier Depression.The best types of reservoir of the first member of Nantun formation are pyroclastic rock and clastic rock in Beier Depression. The main types of clastic rock are lithic sandstone and feldspathic lithic sandstone, whose maturity is low. The secondary pore is the main reservoir space, which includes intragranular dissolved pore, interstitial material dissolved pore, corrosion intergranular pore, intragranular dissolved pore of pyroclastic. Generally, the microscopic characteristics of reservoirs are bad in the first member of Nantun formation.The reservoir’s physical characteristics are low porosity and low permeability-low porosity and super-low permeability in the first member of Nantun formation in Beier depression. The secondary pore is the main reservoir space type, and this horizon is located in anomalously high porosity zone in vertical. In the plane, The Sudeerte buried hill tectonic belt and Beizhong sub-depression physical characteristics. The reservoirs are located in braided delta plain, front, fan delta plain and front subphase. The main diagenesis are compaction, cementation, metasomatism and dissolution. The compaction and cementation decrease the reservoir space, but metasomatism and dissolution enlarge the space. The main lithology of pyroclastic rock is tuff, sedimentary tuff and tuffaceous sandy conglomerate. The main diagenesis stage of reservoir of the first member of Nantun formation is A2, and diagenesis stage B is the second one. The main diagenism facies are tuffaceous corrosion diagenism facies, feldspar corrosion diagenism facies, calcite cementation diagenism facies, shale cementation diagenism facies, mud stone compaction diagenism facies and compaction and cementation diagenism facies.The paper shows that the main controlling factors are the distribution of hydrocarbon kitchen, the favorable sedimentary facies belt, favorable diagenism facies, and the existence of ancient unconformity by analyzing comprehensively seismic, well logging, logging, SEM, casting thin sections, production test, geochemical analysis data. Based on the comprehensive analysis of four main controlling factors, braided delta plain, front, fan delta plain and front subphase are the favorable sedimentary facies belts, and the favorable diagenesis facies belts are tuffaceous corrosion diagenism facies and feldspar corrosion diagenism facies. Considering the distribution of hydrocarbon kitchen and ancient unconformity, combine favorable sedimentary and diagenism facies belts to protect the high-quality reservoir.更多还原