基于沥青溶解前后岩心样品的物性、密度、纵横波时差、电阻率和核磁共振等实验,对沥青质碳酸盐岩储集层的岩石物理特征和测井响应特征进行了研究。实验表明：①沥青会破坏储集层的孔隙结构,导致储集层有效储集空间减小、渗透性降低;②随着沥青含量的增加,纵横波时差普遍减小,而密度和电阻率值则普遍增大;③随着沥青含量增加,纵波时差和密度变化相对较小,而横波时差和电阻率变化相对较大;④沥青核磁共振横向驰豫时间（T2）普遍小于3 ms,且沥青成熟度越高,T2值越小。据此提出基于常规与特殊测井相结合的沥青质碳酸盐岩储集层的沥青含量、有效孔隙度和含水饱和度评价方法,并应用于四川盆地安岳气田80多口气井的寒武系龙王庙组碳酸盐岩储集层,划分出沥青平面富集区带,可作为气藏开发井井位部署的依据。图8表3参12
赖强
,
谢冰
,
吴煜宇
,
黄科
,
刘兴刚
,
金燕
,
罗文军
,
梁涛
. 沥青质碳酸盐岩储集层岩石物理特征及测井评价——以四川盆地安岳气田寒武系龙王庙组为例[J]. 石油勘探与开发, 2017
, 44(6)
: 889
-895
.
DOI: 10.11698/PED.2017.06.06
The petrophysical and logging response characteristics of asphaltene carbonate reservoirs were examined based on the measurement of porosity and permeability, density, compressional and shear wave slowness, resistivity and Nuclear Magnetic Resonance transverse relaxation time (T2) of cores before and after the bitumen dissolving. The results show that (1) the asphalt can damage the pore structure of the reservoir and cause reduction of effective reservoir space and permeability; (2) with the increase of asphalt content, the compression and shear wave slowness generally decrease while the density and resistivity increase; (3) with the increase of asphalt content, the compressional wave slowness and density change less, while the shear wave slowness and resistivity change larger; and (4) the T2 values of asphalt are generally less than 3 ms, and the higher the maturity of the asphalt, the lower the T2 value. Based on these experiments, a method based on conventional and special logging methods was presented to evaluate asphalt content, effective porosity and water saturation in asphaltene carbonate reservoirs. The method has already been applied to 80 wells in the Longwangmiao Formation of the Anyue gas field in the Sichuan Basin to pick out zones rich in asphalt on the plane, which has effectively guided the selection of well location in the gas reservoir development.
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