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1. 中国石化 河南油田分公司 油气开发管理部, 河南 南阳 473132;
2. 中国石油 长庆油田分公司 第八采油厂, 西安 710000;
3. 西安石油大学, 西安 710065
详细信息
1. 中国石化 河南油田分公司 油气开发管理部, 河南 南阳 473132;
2. 中国石油 长庆油田分公司 第八采油厂, 西安 710000;
3. 西安石油大学, 西安 710065
Development characteristics and controlling factors of fractures in deep-buried tight oil reservoirs of 3rd member of Paleogene Hetaoyuan Formation in southeast An'peng area, Nanxiang Basin
1. Oil and Gas Development Management Department, SINOPEC Henan Oilfield Branch Company, Nanyang, Henan 473132, China;
2. No.8 Oil Production Plant, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710000, China;
3. Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
1. Oil and Gas Development Management Department, SINOPEC Henan Oilfield Branch Company, Nanyang, Henan 473132, China;
2. No.8 Oil Production Plant, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi 710000, China;
3. Xi'an Shiyou University, Xi'an, Shaanxi 710065, China
为了探明深部致密油储层天然裂缝发育规律及其影响因素,以南襄盆地泌阳凹陷安棚东南区古近系核桃园组三段II-VI油层组致密油藏为例,利用大量岩心、薄片、物性、成像及常规测井、注水压驱等资料,系统开展了致密油藏裂缝综合评价。该区目的层II-VI油层组属扇三角洲前缘沉积,储层岩屑含量较高,为近源沉积;储层孔隙度与渗透率之间具有良好的正相关性。对于不同岩性砂岩储层,裂缝主要发育于细砂岩中,其次为粉砂岩,而含砾砂岩中裂缝通常不发育。目的层主要发育高角度缝及直立缝,其占比可达87.8%,低角度斜交缝和水平缝分别占比达7.3%及4.9%。目的层致密储层裂缝发育主控因素主要包括岩性、沉积微相及局部构造;厚度较薄、粒度较细的单砂体或复合砂体部位裂缝通常较为发育。裂缝主要发育于前缘河道、河道侧翼、河口坝及其外缘远砂坝砂体部位;而席状砂及前缘三角洲微相中裂缝不发育。此外,裂缝主要发育于构造转折端,且主要发育于正向构造的顶部及翼部。目的层裂缝主要沿着WE向、NE向分布,其次为NW向;裂缝主要形成于新近纪坳陷期(喜马拉雅晚期)。裂缝是导致致密油储层水窜的重要因素,因而要加强裂缝发育程度、扩展规模及方向的动、静态监测。
In order to investigate the natural fracture development law and its influencing factors in deep-buried tight oil reservoirs, in this paper, we take the Ⅱ-Ⅵ tight oil formations of the third member of Paleogene Hetaoyuan Formation in southeast An'peng area of the Biyang Sag, Nanxiang Basin as an example. A systematic evaluation has been carried out based on a large number of core, thin section, physical properties, imaging, conventional logging and water flooding data. The Ⅱ-Ⅵ oil formations belongs to fan-delta front deposits with high content of rock debris, which are near-source deposits. There is a good positive correlation between reservoir porosity and permeability. For sandstone reservoirs with different lithologies, fractures are mainly developed in fine sandstone, followed by siltstone, but not in pebbled sandstone. In the target layer, high-angle and vertical fractures are dominant, accounting for 87.8%, while low-angle and horizontal fractures account for 7.3% and 4.9%, respectively. The main controlling factors for fracture development in tight reservoirs in the target formations include lithology, sedimentary microfacies and structural characteristics. Fractures are usually developed in single or composite sand bodies with thinner thickness and finer granularity. Fractures are mainly developed in front channel, the flank of channel, mouth bar and the outer edge of far sand bar body. However, fractures do not develop in sheet sand or front delta microfacies. In addition, fractures mainly develop at the transition end of structure, and mainly at the top and wing of forward structure. The fractures in the target strata are mainly distributed along the WE and NE directions, followed by NW direction. It is believed that the fractures were mainly formed in the Neogene depression period (late Himalaya). Fracture is an important factor leading to water channeling in tight oil reservoirs, so it is necessary to strengthen the dynamic and static monitoring of fracture development degree, expansion scale and direction.
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