柴达木盆地红柳泉构造下干柴沟组下段岩性油藏主控因素  

Main Controlling Factors of Lithologic Reservoirs of Lower Ganchaigou Formation below Hongliuquan Structure of Qaidam Basin

作　　者：牟中海[1] 马力宁 马达德 廖锐[1] 徐良威 

机构地区：[1] 西南石油大学地球科学与技术学院 [2] 中国石油青海油田司

出　　处：《中国石油勘探》2014年第6期24-32,共9页China Petroleum Exploration

基　　金：中国石油天然气股份有限公司重大科技专项“柴达木盆地老区稳产提高采收率技术研究成果”(2011E-0306)

摘　　要：通过地质、地震、测井、分析化验资料的综合分析,从沉积作用、成岩作用、断裂作用3个方面,对柴达木盆地红柳泉构造下干柴沟组下段(E31)岩性油藏成藏的三大控制因素——沉积微相、胶结作用、微断层进行了分析。研究认为红柳泉构造下干柴沟组下段岩性油藏并非相控,沉积微相只控制砂体的分布。压实作用主要使储层变得致密,储集性能变差,但对物性或含油气性在横向上的变化影响不大;胶结作用在红柳泉构造上倾方向产生封堵,大致在红113井、红22井、红15井一线形成封堵带,并使油气主要聚集于斜坡带中部,胶结矿物主要是硬石膏、石膏、方解石等。微断层发育区是红柳泉构造油气主要分布区,不同微断层封堵条件的差异则是岩性油藏的重要控制因素,造成了相邻井含油气性的明显差异。Based on comprehensive analysis of geological, seismic, logging and testing data and focusing on three areas of sedimentation, diagenesis and breaking effect, this paper elaborates three main controlling factors of lithologic reservoirs of lower Ganchaigou Formation （E31） below Hongliuquan structure of Qaidam Basin - sedimentary microfacies, cementation and micro faults. The study indicates that the lithologic reservoirs of the E3~ in Hongliuquan structure is not facies controlled and the sedimentary microfacies only controls distribution of sand bodies. Compactness makes the reservoir compact but exerts little impact on horizontal changes in physical properties and oil bearing properties of the reservoirs. Cementation results in sealing in the updip direction of Hongliuquan structure, leading to a sealing zone along Hong113 Well, Hong22 Well and Hongl5 Well. Therefore, oil and gas are accumulated mainly in the middle position of the slope zone. Cementation minerals are mainly anhydrite, gypsum and calcite. Micro fault development zone is the main oil and gas bearing zone in Hongliuquan structure. The differences in sealing conditions of different micro faults are the important controlling factors for lithologic reservoirs, causing the apparent difference in the oil bearing properties of neighboring wells.

关 键 词：柴达木盆地 红柳泉构造 岩性油藏 沉积微相 胶结作用 微断层 主控因素 

分 类 号：TE111.3[石油与天然气工程—油气勘探]