齐家—古龙地区扶杨油层储层综合评价

【作者】 梁江平；

【导师】 李椿；

【作者基本信息】 大庆石油学院 ， 矿产普查与勘探， 2002， 硕士

【摘要】 研究区齐家—古龙地区横跨松辽盆地北部西部斜坡和齐家—古龙坳陷两个一级构造单元，主体位于松辽盆地北部齐家—古龙坳陷。目的层段扶杨油层(泉头组三四段)沉积时期处于松辽盆地坳陷期的加速沉降阶段，受控于北部和西部沉积体系韵扶杨油层处于三角洲分流平原及三角洲前缘亚相，沉积的各种河道砂体平面上错迭连片，为扶杨油层形成大面积岩性油藏提供了良好的储集空间。其上的青山口组一段厚层暗色泥岩为扶杨油层油藏的形成提供了充足的油源，T2构造反射层大量发育的正断层为油气运移提供了通道。 大量化验测试资料分析结果表明，扶杨油层砂岩储层成份成熟度较低，岩石类型以岩屑质长石砂岩和长石质岩屑砂岩为主。由于砂岩储层成份成熟度低，后期埋藏历史较长，储层经历了较强的成岩作用，主要成岩作用类型有压实、胶结和溶解作用。其成岩序列可划分为5个共生组合，成岩作用阶段处于晚咸岩A期和晚成岩B期。砂岩储层成岩相可划分方解石胶结、伊利石充填、石英次生加大和溶蚀溶解四种成岩相类型。不同成岩相的分布规律有所不同。砂岩储层的孔隙类型可归纳为粒间孔隙、粒内孔隙、填隙物内孔隙、裂缝孔隙和溶蚀孔隙五种类型。储层存在着严重的速敏、水敏、酸敏、碱敏和盐敏现象。成岩作用对储层的物性、敏感性和含油性影响很大，总体表现出随着埋深的增加，成岩作用加强，使得储层孔渗条件变差，含油级别降低。储层主要以Ⅳ2类储层为主，其次为Ⅲ2、Ⅱ2类储层，峰点孔喉半径在0.13～1.5μm之间区域的储层是有利储层，其发育区域是西部扶杨油层形成岩性、断层—岩性油藏的有利地区，主要分布在环齐家～古龙凹陷周边地区，成为扶杨油层勘探的有利区，估算资源量在7～8×10~8t。 经济技术评价结果表明，在现有工艺技术水平，巴彦查干和龙西地区扶杨油层有经济效益。更多还原

【Abstract】 Study area, Qijia-Gulong region, bestride the two first grade tectonic units of western paleo-inclinoform and Qijia-Gulong depression, its main part located in Qijia-Gulong depression. The period of target layer, Fu-Yang oil-bearing layer (the memberS and 4 of Quantou formation) deposited was coincide with accelerated subsided period in down-warped stage of Songliao basin evolution process.Controlled by north and west depositional system, Fu-Yang oil-bearing layer consists of delta distributary plain and delta front sub-facies depsits of delta depositonal system, widely distributed various distributary channel sand deposits come into being favorable reservoir space. Upwardly, The thick dark mudstone of member 1 of Qingshankou formation can provide plenteous oil source for Fu-Yang oil-bearing layer, A large number of formal faults developed in T2 structural layer can provide path for oil migration.Analysis results of a number of testing data indicated that: sandstone reservoir of Fu-Yang oil-bearing layer has lower composition maturity, mainly are feldspathic arenite and lithic arkose. Due to the lower composition maturity and long buried history, sandstone experienced relative intense diagensis, diagensis type mainly are compaction, cementation and dissolution. The diagensis sequence can be divided into 5 associations. The diagensis stage is during late diagenetic A and B period.Lapidofacies of sandstone reservoir can be divided into calcite cementation, illite filling, quartz overgrowth and dissolution four lapidofacies types, which have different distribution rules. 5 pore types of sandstone reservoir, interparticle pore, innerparticle pore, interstitial content pore , fracture pore and dissolution pore, can be recognized. Reservoirs exist serious phenomena of velocity, water, acid, alkali and salt sensitivity. Diagensis greatly affected the porosity-permeability, sensitivity and oil-bearing ability, which characterize by the more intense diagensis, worse porosity- permeability and lower oil-bearing grade with the deeper burial.Reservoirs type mainly are IV2, secondly are III2> 112, its peak semidiameter of pore-throat is between 0.13urn and l.Sum is favorable reservoir, which developed area is the advantageous region located in surrounding depression, and turned into potential area for Fu-Yang oil-bearing layer exploration, predicted reserves about 7~8X 108t.Economic technologicial evaluation results indicated that under present technology, Fu-Yang oil-bearing layer of Bayanchagan and Longxi area have exploitation economy benefit.更多还原