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A method for recovering the dip angle of the foreset deposition at the delta front based on cores

A foreset and delta technology, which is applied in the field of core-based restoration of the foreset depositional dip at the delta front, can solve problems such as difficulty in ensuring accuracy and affecting efficient development of oilfields, and achieve the effect of improving oil recovery

Active Publication Date: 2018-05-01
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Due to the uncertainty of well-to-well correlation and the limitation of the resolution of geophysical data, it is difficult to guarantee the accuracy of mud seepage barrier correlation below the meter level, which greatly affects the efficient development of oilfields

Method used

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  • A method for recovering the dip angle of the foreset deposition at the delta front based on cores
  • A method for recovering the dip angle of the foreset deposition at the delta front based on cores
  • A method for recovering the dip angle of the foreset deposition at the delta front based on cores

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Embodiment

[0048] The W fault block in the study area is a fault nose structure that lifts south and dips north. The target layer belongs to the Gilbert delta front deposition. The reservoir is mainly composed of light gray and light brown coarse siltstone and fine sandstone. The reservoir has been put into production since June 1997. At the beginning, it mainly relied on natural energy for exploitation. Due to the lack of natural energy, the reservoir began to be developed by water injection since October 2000. Affected by the unclear understanding of the mud seepage barrier, the reservoir was flooded with water. The effect is poor, and the overall characteristics are low oil recovery rate, low recovery degree and medium-high water cut.

[0049] Among them, medium-level (3rd, 4th) and low-level (5th, 6th) mud seepage barriers have an important impact on fluid flow and remaining oil distribution during waterflood development in oilfields. However, due to these seepage barriers, the verti...

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Abstract

Disclosed in the invention is a core-based method for recovering a deposition inclination angel of a foreset bed of a delta front. The method comprises the following steps: according to scales of geologic bodies where argillaceous flow barriers are located and stratum dimensions involved in study, the argillaceous flow barriers are divided into six levels from the first level to the sixth level in a descending order; different levels of erosion surfaces are identified from a core and an inclination angle is measured; an inclination relation between a forest bed and a stratum is determined and an inclination relation between the forest bed and a higher-level stratum is divided into two kinds: a same-direction kind and a reversed direction kind; an inclination angle of a stratum at a higher level is determined; a type of a drilling well and a track direction of the drilling well are determined; according to well deviation data, a deviation angle between a well track and a vertical direction is determined; and on the basis of the well type, the construction inclination, and a relationship between a foreset bed inclination and a drilling well track direction, an inclination angle of the forest bed in primary deposit is calculated. Using the method, the inclination angle of the foreset bed in primary deposit can be obtained accurately; stratum comparison can be guided effectively; and the method plays an important role in development scheme formulation and recovery efficiency improvement.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for recovering the dip angle of foreset deposits at the delta front based on rock cores. Background technique [0002] Argillaceous seepage barrier refers to argillaceous rocks with no or poor permeability, including mudstone, silty mudstone and argillaceous siltstone in lithology, and its interface is a definite physical interface, which is generally formed by the Formed by weakening hydrodynamic conditions. Affected by sea (lake) flooding of different scales and sedimentary environment changes, the thickness and spatial distribution range of mud seepage barriers vary greatly. Some thicknesses can reach several meters or tens of meters, and the distribution is stable. Some are only a few centimeters or tens of centimeters thick, and the plane distribution range is less than one well spacing, and even the smallest ones appear between the laminae, which can...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V11/00G01N33/24
CPCG01N33/24G01V11/00
Inventor 刘丽赵晓明
Owner SOUTHWEST PETROLEUM UNIV
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