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沉积学报  2015 

沾化凹陷罗家地区沙三下段泥页岩储层特征

DOI: 10.14027/j.cnki.cjxb.2015.04.018, PP. 795-808

Keywords: 沾化凹陷,罗家地区,沙河街组,泥页岩,储层特征

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Abstract:

沾化凹陷罗家地区古近系沙河街组沙三下段发育100~300m厚的暗色泥页岩,具有较大的油气资源量和勘探潜力.研究表明,罗家地区的这套泥页岩为盐度较高、强还原性的深湖—半深湖沉积,岩石类型以泥岩、灰岩及之间的过渡岩性为主,碳酸盐矿物含量一般高于50%.根据泥页岩纹层厚度、组合方式、比例和稳定性,将深水泥页岩划分为6种类型,其中以薄层状泥质灰岩为主.泥页岩储层孔隙度为2%~8%,平均5.3%;渗透率变化较大,一般为(1~10)×10-3μm2,平均为7.5×10-3μm2,为低孔低渗的非常规储层.储集空间类型多,储层发育的裂缝包括构造裂缝、层间微裂缝和成岩缝,孔隙包括矿物晶间孔、溶蚀孔、有机质孔等.储层质量受矿物组成和岩相、成岩作用、有机质含量等因素共同控制,其中有机质含量是控制该套泥页岩储层物性的主要内在因素.

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