王成,张安达
WANG Cheng,ZHANG Anda

• 1:大庆油田有限责任公司勘探开发研究院
• 2:黑龙江省致密油和泥岩油成藏研究重点实验室

摘要(Abstract)：

海拉尔盆地乌尔逊—贝尔凹陷大磨拐河组和南屯组储层岩性多样、孔隙成因复杂,导致相近深度下储层物性的巨大差异和孔隙演化过程的复杂化。以储层岩心薄片、铸体薄片、CT扫描和压汞测试等储层微观特征分析资料为基础,系统开展了储层岩性特征、物性特征、成岩阶段、孔隙结构、孔隙成因、孔隙演化与储层致密化过程研究。结果表明:储层岩性具有岩屑和杂基含量高、结构成熟度和成分成熟度较低的特点,孔隙类型可分为原生、次生孔隙两大类,共8种类型;成岩阶段处于早成岩阶段B期—中成岩阶段B期;埋深超过2 400 m后原生孔隙度降低至10%以下,储层呈现致密化状态;在埋深为1 000～1 800 m和2 300～2 800 m处储层存在相对高孔渗带,粒间溶孔和粒内溶孔明显增多,最高比例可达到80%,孔隙喉道一般为细喉,储层以Ⅱ级孔隙结构为主,为致密储层中的次生溶孔"甜点段"。
Damoguaihe and Nantun Formations' reservoirs in Wuerxun-Beier Sag of Hailar Basin are characterized by diverse lithologies and complex pore geneses, which lead to the great difference of the physical properties at similar depths and complexity of the pore evolution process. Based on the analyzed data of the reservoir micro-characteristics such as the core thin section, cast thin slice, CT scanning, mercury injection test and so forth, the lithological and physical characteristics, diagenetic stage, pore structure, pore genesis-evolution and compaction process of the reservoir were systematically studied. The results show that the reservoir lithologies are characterized by high-content debris and matrix, low-maturity structure and composition, the pore types can be divided into primary and secondary pore types in all eight types;the diagenetic stage is mainly from early diagenetic stage B to middle diagenetic stage B;when the burial depth exceeds 2 400 m, the primary porosity decreases to less than 10% and the reservoir is compact;while the buried depths are about 1 000-1 800 m and 2 300-2 800 m, the relative high-poroperm belts exist in the reservoirs, the intergranular and intragranular dissolved pores increase obviously and the highest proportions can reach 80%, their pore throats are generally fine throats, the reservoir is mainly composed of Grade II pore structure, which constitutes the "sweet spot interval" with the secondary solution pore in the tight reservoirs.

关键词(KeyWords)： 海拉尔盆地;储层特征;孔隙类型;孔隙成因;孔隙演化;成岩阶段
Hailar Basin;reservoir characteristic;pore type;pore origin;pore evolution;diagenetic stage

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气股份有限公司重大专项“海拉尔—依舒等外围盆地勘探技术完善与效益增储”(2016E-0202)

作者(Author): 王成,张安达
WANG Cheng,ZHANG Anda

DOI: 10.19597/j.issn.1000-3754.201905001

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