Method for judging carbonatite hole crack growth characteristics

Abstract

The invention discloses a method for judging carbonatite hole crack growth characteristics. The method comprises the following steps: a) processing three-dimensional seismic data and performing breakage explanation and position tracking; b) utilizing seismic data to forecast effective reservoir thickness and effective reservoir porosity; c) analyzing reservoir lithology, reservoir space type, filled degree of hole crack reservoir and change rule of the filled degree of hole crack reservoir along longitudinal direction and horizontal direction; d) while confirming boundary, researching connectivity of reservoir along the longitudinal direction and horizontal direction, inter-well connectivity and oil-gas-water boundary; e) establishing regional oil and gas reservoir profile and unit oil and gas reservoir profile according to fault line, tectonic line, fluid line, pinch-out line and phase-change line, depicting, dividing a developing unit and drawing a developing unit and oil bearing area graph. According to the method provided by the invention, the drilling rate of the reservoir is increased, the leading comprehensive success rate of exploration and development drilling in China is achieved and single-well high yield and stable yield are achieved.

Description

technical field [0001] The invention relates to the technical field of exploration and development of carbonate rock oil and gas reservoirs, in particular to a method for judging the development characteristics of carbonate rock pores and fractures. Background technique [0002] Among the proven reserves of the Zhonggu 8 and 43 well areas of EPCC in Tazhong, the ratio of "string + piece": "piece": "messy" proved reserves is 3.3:1.3:5.4, and the "string + piece" of the geological reserves produced in the preliminary development plan ":"Piece":"Messy"reflection reserve ratio: 3.2:1.9:49,000 tons. However, in the current drilling and completion, only the "beaded" reflective reservoirs are drilled and revealed, and the drilling success rate is >80%, while the "flaky" or "messy and weak" reflective reservoirs have not been drilled to obtain industrial oil and flow, and no breakthrough has been made in exploration. The production of beaded reflections (cavity type) is related ...

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Problems solved by technology

[0004] However, the existing technologies represented by the above-mentioned patent documents cannot be directly applied to carbonate reservoirs such as the Lower Ordovician Yingshan Formation in the Zhonggu 8 and 43 well areas in Tazhong, which are mainly transformed by karst. Fractures or dissolution pores associated with fractures, rock matrix porosity is very low

These reservoir spaces are mainly the result of superimposed transformation of multi-stage supergene dissolution and later ascending dissolution, so the reservoir structure is complex and heterogeneous. Provides helpful guidance in undrilled areas

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