吴起—安塞地区长9、长10成藏控制因素分析

发布时间：2018-05-05 23:26

本文选题：吴起-安塞地区 + 长9、长10　；参考：《西安石油大学》2015年硕士论文

【摘要】：吴起-安塞地区长9、长10油层组属于典型的低渗透砂岩岩性油藏,随着勘探开发投入的不断增加,已经发现一定规模的控制储量及预测储量。然而,目前长9、长10储层的成藏控制因素和富集规律还不够明确,严重制约了勘探开发的深入,需要开展系统的成藏控制因素研究。本文以研究区长9、长10为研究对象,以层序地层学、沉积学和石油地质学为理论指导,在广泛调研前人研究成果的基础上,充分利用测井、岩心观察、铸体薄片、压汞、核磁共振、碳氧同位素、含氮化合物、流体包裹体等一系列分析化验资料,对长9、长10油气成藏控制因素进行系统研究。研究认为:长91发育三角洲前缘沉积,长92、长101发育三角洲平原沉积,其中长91、长101为主力储层;长91属于小孔微喉型储层,具有相对“高孔低渗”特征,油源来自紧邻的李家畔页岩,疏导体系类型为裂缝和孔隙,而长101属于小孔微细喉储层,具有“低孔高渗”特征,油源来自工区西南方向的高阻泥岩,通过超压开启同沉积断层,油气向下运移进入长101砂体,并在长101砂体内发生顺层运移,油气主要在构造岩性圈闭和成岩圈闭中成藏;长9发育致密油,受烃源岩的生烃强度和储层质量控制,在中西部长91储层物性好的地方最为有利;长10发育构造-岩性油藏,受同沉积断层沟通的烃源岩性质、沟通的砂体特征、砂体连通性、鼻隆构造及成岩圈闭的分布综合控制,在东北部成岩圈闭发育处最为有利。
[Abstract]:Chang9 and Chang10 reservoirs in Wuqi-Ansai area are typical low-permeability sandstone lithologic reservoirs. With the increasing investment in exploration and development, controlled reserves and predicted reserves on a certain scale have been discovered. However, at present, the controlling factors of reservoir formation and the law of accumulation in Chang9 and Chang10 reservoirs are not clear enough, which seriously restricts the development of exploration and development, so it is necessary to carry out systematic research on the controlling factors of reservoir formation. This paper takes Chang 9 and Chang 10 as research objects, takes sequence stratigraphy, sedimentology and petroleum geology as theoretical guidance, and makes full use of logging, core observation, casting thin slice, mercury injection on the basis of extensive investigation of previous research results. Nuclear magnetic resonance (NMR), carbon and oxygen isotopes, nitrogen compounds, fluid inclusions and a series of analytical and laboratory data were used to study the controlling factors of hydrocarbon accumulation in Chang9 and Chang10. It is considered that Chang91 developed delta front sediments, Chang92and Chang101 developed delta plain deposits, of which Chang91and Chang101 are the main reservoirs, and Chang91 belongs to microlaryngoid reservoirs with relatively high porosity and low permeability. The oil source comes from the adjacent Lijiaban shale, the dredge system type is fracture and pore, while Chang 101 belongs to the microlarynx reservoir with small pore, which has the characteristics of "low porosity and high permeability", and the oil source comes from the high resistivity mudstone in the southwest direction of the working area. Through overpressure opening of synsedimentary fault, oil and gas migrate downward into Chang 101 sand body, and occur along formation migration in Chang 101 sand body. Oil and gas are mainly formed in tectonic lithologic traps and diagenetic traps. Under the control of hydrocarbon generation intensity and reservoir quality of source rock, it is most advantageous where the physical property of Chang91 reservoir is good in the central and western part of China, and Chang10 is developed in tectonic-lithologic reservoir, which is affected by the source rock properties, the characteristics of sand body and the connectivity of sand body, which are communicated with sedimentary faults. The distribution of bibulong structure and diagenetic trap is the most favorable in the northeast diagenetic trap.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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