泌阳凹陷黑龙庙地区油气储层特征及影响因素

Characteristics and Influential Factors of Oil and Gas Reservoir in Heilongmiao Area of Biyang Sag

闫洁 李想

YAN Jie LI Xiang

中国石油化工股份有限公司上海海洋油气分公司, 上海 200120

SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

泌阳凹陷黑龙庙地区古近系核桃园组发育水下冲积扇碎屑岩储层，岩石类型以岩屑石英砂岩、岩屑砂岩为主。经历了早成岩B期、中成岩A1亚期、中成岩A2亚期演化阶段。压实-压溶作用和胶结作用对储层物性影响较大。通过岩心观察、薄片鉴定、图像分析、常规物性、压汞实验及测井资料研究表明，该区核桃园组水下冲积扇碎屑岩储层的储集空间以次生孔隙为主，包括黑云母溶孔、颗粒溶孔－杂基溶蚀微孔－颗粒溶蚀微孔的孔隙组合。储层孔喉特征均为细孔微细喉型，孔喉半径小且分选差，排驱压力较高，为特低孔－超低孔型、超低渗－特低渗型储层。溶解作用对改善孔渗效果不佳。研究区储层具有中等的水敏性和酸敏性，弱的速敏性、盐敏性和碱敏性。在今后对泌阳凹陷南部断超带的油气勘探中或在油层保护与改造中，这些基础数据对泌阳凹陷南部断超带今后的油气勘探及油层保护与改造具有一定的指导意义。

In Heilongmiao area of Biyang Sag, the clastic reservoirs of subaqueous alluvial fan in Paleogene Hetaoyuan Formation are dominated by lithic quartz sandstone, lithic sandstone.They have experienced the phase B of early diagenesis stage, A1 sub-stage and A2 sub-stage of middle diagenesis. Compaction-pressure solution and cementation have great influence on reservoir property. The studies of analytic data including core sample observation, thin section identification, image analysis, physical property, mercury injection experiment and logging data indicate that the reservoir spaces of reservoir rocks consist mainly of secondary pores, including biotite dissolution pores, combination pores of grain dissolution pores, matrix dissolution micro-pores and grain dissolution micro-pores. The pore throats of the reservoir are characterized by small porethroat, poor sorting, and high displacement pressure, and the reservoir rocks are classified as ultra low-super low porosity and permeability reservoir. The effect of dissolution on improving the porosity and permeability is not obvious. The reservoirs in the study area have medium water sensitivity and acid sensitivity, weak speed sensitivity, salt sensitivity and alkali sensitivity. These fundamental data have some guiding significance for oil and gas exploration in the southern Biyang Sag or in the protection and reconstruction of oil reservoir in the future.

https://doi.org/10.3969/j.issn.1008-2336.2018.02.021