胡尖山地区长2、延8-延10油层组油藏特征及差异控制因素

Characteristics of Reservoirs and Controlling Factors on Their Difference in Chang2 and Yan8-Yan10 Reservoirs in Hujianshan Area

胡尖山地区长2、延8-延10石油资源丰富,但原油分布的差异性较强。为了查明原油分布的控制因素,通过油藏剖面的详细解剖,明确了研究区内的油藏类型及特征。通过对不同类型油藏的原油分布特征与构造、沉积环境、成岩作用、遮挡条件等之间的关系研究,搞清了不同油藏类型的控制因素。研究结果表明,胡尖山地区长2、延8-延10油层组油藏类型主要为岩性油藏和构造-岩性油藏。其中,岩性油藏包括岩性上倾尖灭油藏和砂岩透镜体油藏;构造-岩性油藏主要为背斜-岩性油藏。岩性油藏的主控因素主要为沉积环境和成岩作用,其中优势沉积相带能够为原油富集提供物质基础,而成岩作用是原油富集的关键要素;构造-岩性油藏的主控因素包括鼻隆构造的存在与否,泥质沉积与致密砂岩的遮挡以及砂体与鼻隆构造之间的配置关系。

Hujianshan area is rich in oil resources, but the distribution of crude oil is quite different. In order to find out the controlling factors of crude oil distribution, the reservoir types and characteristics in the study area were clarified through the detailed anatomy of reservoir profile. By studying the relationship between the distribution characteristics of crude oil in different types of reservoirs and the structure, sedimentary environment, diagenesis and occlusion conditions, the controlling factors of different reservoir types were determined. The results show that the reservoir types of Chang2 and Yan8-Yan10 in Hujianshan area are mainly lithologic reservoir and tectonic-lithologic reservoir. Among them, lithologic reservoirs include lithologic up-tilting point extinction reservoir and sandstone lens reservoir, and tectonic-lithologic reservoir is mainly anticline-lithologic reservoir. The main controlling factors of lithologic reservoir are sedimentary environment and diagenesis, in which the dominant sedimentary facies zone can provide material basis for crude oil enrichment, while diagenesis is the key factor of crude oil enrichment. The main controlling factors of structural-lithologic reservoir include the existence of nasal uplift structure, the occlusion of mudstone deposition and tight sandstone, and the configuration relationship between sand body and nasal uplift structure.